Chorale Preludes 18 Choraãœë†le Von Verschiedener Art or the Great Eighteen
The Great Xviii Chorale Preludes, BWV 651–668, are a set of chorale preludes for organ prepared by Johann Sebastian Bach in Leipzig in his final decade (1740–1750), from earlier works equanimous in Weimar, where he was court organist. The works form an encyclopedic collection of big-calibration chorale preludes, in a variety of styles harking dorsum to the previous century, that Bach gradually perfected during his career. Together with the Orgelbüchlein, the Schübler Chorales, the 3rd volume of the Clavier-Übung and the Canonic Variations, they represent the top of Bach's sacred music for solo organ.[1]
History [edit]
Early versions of almost all the chorale preludes are thought to date back to 1710–1714, during the period 1708–1717 when Bach served equally courtroom organist and Konzertmeister (managing director of music) in Weimar, at the court of Wilhelm Ernst, Duke of Saxe-Weimar.[2] As a upshot of encouragement from the Duke, a devout Lutheran and music lover, Bach developed secular and liturgical organ works in all forms, in what was to be his most productive flow for organ limerick. Equally his son Carl Philipp Emanuel Bach mentions in his obituary or nekrolog: "His grace's delight in his playing fired him to effort everything possible in the art of how to treat the organ. Here he too wrote well-nigh of his organ works."[three] During Bach's time at Weimar, the chapel organ at that place was extensively improved and enlarged; occupying a loft at the east end of the chapel merely below the roof, it had two transmission keyboards, a pedalboard and about a dozen stops, including at Bach'south request a row of tuned bells. Information technology is probable that the longer chorale preludes equanimous so served some ceremonial role during the services in the court chapel, such as accompanying communion.[4]
When Bach moved to his afterward positions every bit Kapellmeister in Köthen in 1717 and cantor at the Thomaskirche in Leipzig in 1723, his obligations did not specifically include compositions for the organ. The shorthand manuscript of the Great Eighteen, currently preserved equally P 271 in the Berlin State Library, documents that Bach began to set the collection around 1740, after having completed Part III of the Clavier-Übung in 1739. The manuscript is made upward of three parts: the vi trio sonatas for organ BWV 525–530 (1727–1732); the Canonic Variations on "Vom Himmel hoch da komm' ich her" BWV 769 added at the same time as the chorale preludes (1739–1750); and an early version of Nun komm' der heiden Heiland (1714–1717), appended after Bach's expiry.[5]
The starting time thirteen chorale preludes BWV 651–663 were added by Bach himself between 1739 and 1742, supplemented by BWV 664 and 665 in 1746–7. In 1750 when Bach began to suffer from blindness before his decease in July, BWV 666 and 667 were dictated to his student and son-in-law Johann Christoph Altnikol and copied posthumously into the manuscript. Just the first page of the last choral prelude BWV 668, the then-called "deathbed chorale", has survived, recorded by an unknown copyist.[6] The piece was posthumously published in 1751 as an appendix to the Art of the Fugue, with the title "Wenn wir in höchsten Nöthen sein" (BWV 668a), instead of the original title "Vor deinen Thron tret ich hiermit" ("Before your throne I now appear").
There have been various accounts of the circumstances surrounding the composition of this chorale. The biographical account from 1802 of Johann Nicolaus Forkel that Altnikol was copying the work at the composer's deathbed has since been discounted: in the 2d half of the eighteenth century, it had become an apocryphal legend, encouraged past Bach'due south heirs, Carl Philipp Emmanuel Bach and Wilhelm Friedmann Bach. The piece, nonetheless, is now accustomed as a planned reworking of the shorter chorale prelude Wenn wir in höchsten Nöthen sein (BWV 641) from the Orgelbüchlein (c 1715).[seven] [8] [ix]
Compositional models [edit]
The breadth of styles and forms represented by the Not bad Eighteen is as diverse as that of Bach's Well Tempered Clavier for the keyboard. The pieces are on a big and frequently ballsy scale, compared with the miniature intimacy of the choral preludes of the Orgelbüchlein. Many of the chorale preludes pay homage to much older models in the German liturgical tradition (Georg Böhm, Buxtehude and Pachelbel), only the parallel influence of the Italian concerto tradition is as visible. It is a mid-eighteenth century salute to the musical traditions of the previous century. Dissimilar Part Iii of the Clavier-Übung, where Bach pushed his compositional techniques for the organ to new limits, the chorale settings of Bach's Nifty Eighteen represent "the very quintessence of all he elaborated in Weimar in this field of fine art;"[xi] they "transcend by their magnitude and depth all previous types of choral prelude";[12] and they display a "workmanship as nearly flawless as we have any right to expect of a homo."[13] The eighteen are characterized by their freely developed and independent accessory filling the long intervals betwixt the successive lines of the cantus firmus, a characteristic of their large calibration which has not pleased all commentators.[fourteen]
Chorale motet [edit]
The Renaissance motet, in madrigal style, forms the model for the chorale motet, used in BWV 665 and 666. Each line of the chorale is established as a point of false for the unlike parts, which keep to a common rhythm. This manner, the earliest used by Bach, was that employed in his Mühlhausen cantatas, such equally the funeral cantata Actus Tragicus, BWV 106. A common distinctive feature is the employ of musical figures to illustrate item lines or even words in the hymn text.[15]
Chorale partita [edit]
The chorale partita is a set of variations on a chorale tune. Normally each variation repeats the chorale melody and is substantially a separate motility. This style goes dorsum to the Dutch composer Sweelinck and was adopted past his German pupils Scheidt and Scheidemann; the tradition was connected at the turn of the 18th century by Georg Böhm and Pachelbel from Thuringia, who provided the model for Bach.[16] Bach, all the same, bankrupt the norm in the 2 chorale preludes of this genre, BWV 656 and 667, which each accept but a small number of variations (3 and 2). This might be a homage to Dieterich Buxtehude, who had written similar partitas and whose music and virtuosity at the organ is known to have exercised a considerable influence on Bach in his youth.[17]
Ornamental chorale [edit]
In the ornamental chorale, a form invented and popularized in Northern Frg by Scheidemann, the chorale melody is taken by 1 voice in an elaborate and highly embellished form. Buxtehude was one of its most historic exponents, with his individual expressive "song" ornament.
Five chorale preludes of the Great 18 were written in this style: BWV 652, 653, 654, 659 and 662.[xviii]
Cantus firmus chorale [edit]
The cantus firmus chorale: The tune of the chorale is sounded in long notes throughout the piece, was established and popularized in central Federal republic of germany by Pachelbel. One of his students was Johann Christoph Bach Three, Bach'due south older brother, who in turn taught Bach keyboard technique. There are half-dozen examples of the cantus firmus chorale: BWV 651, 657, 658, 661, 663 and 668.[19]
Chorale trio [edit]
The chorale trio has the form of a trio sonata in which the upper parts are played on the ii keyboards of the organ and the basso continuo role is played on the pedals. Bach elevated this form to the condition of contemporary Italian trio sonatas or double concertos of Antonio Vivaldi and Giuseppe Torelli: information technology is probably his unmarried most original innovation in the repertoire of organ chorales. The three virtuosic chorale preludes of this type are BWV 655, 660 and 664.[20]
Chorale Preludes BWV 651–668 [edit]
- The brief descriptions of the chorale preludes are based on the detailed analysis in Williams (1980) and Stinson (2001).
- To heed to a MIDI recording, please click on the link.
- BWV 651 Fantasia super Komm, Heiliger Geist [Come, Holy Ghost], canto fermo in Pedale (cantus firmus chorale) play(assistance·info)
- Over the pedal chorale melody sweeps an exuberant toccata, conveying the "rushing mighty wind"[21] of the Holy Spirit; a 2nd ornamented subject symbolises the Hallelujadue south at the culmination of the hymn.
- BWV 652 Komm, Heiliger Geist [Come, Holy Ghost], alio modo a 2 Clav. due east Pedale (ornamental chorale) play(assistance·info)
- The ornate chorale melody sings out above a lyrical and calm three-function sarabande, with flowing semiquavers marking the Hallelujasouth of the coda, in this, the longest of the chorale preludes.
- BWV 653 An Wasserflüssen Babylon [By the waters of Babylon], a 2 Clav. e Pedale (ornamental chorale) play(help·info)
- The hymn "An Wasserflüssen Babylon" is a paraphrase of Psalm 137, a complaining in exile in Babylon. The gentle ritornellos of the accompanying parts in the 2 upper parts and pedal of this sarabande, anticipate the ornamented chorale in the tenor, evoking the mournful tone of the hymn, the "organs and harps, hung up on willow trees", based on Psalm 137. In a famous concert in 1720 on the great organ in St Catherine'due south Church building in Hamburg, Bach had improvised for virtually half an hour on the same hymn tune as a tribute to the church'south organist Johann Adam Reinken and his historic fantasy on the aforementioned theme.
- BWV 654 Schmücke dich, o liebe Seele [Adorn yourself, dearest soul], a 2 Clav. e Pedale (ornamental chorale) play(help·info)
- The soberly ornamented, but melismatic, chorale, Schmücke dich, o liebe Seele, in the soprano alternates with the dance-like ritornellos of the two intertwining lower parts above a pedal bass; the unearthly counterpoint betwixt the four unlike parts creates an air of bully quiet, a "rapturous meditation" on the rite of communion.[22] The adornment in the title is illustrated by the French-fashion ornamentation of the upper parts.
- BWV 655 Trio super Herr Jesu Christ, dich zu uns wend [Lord Jesu Christ, plough to united states], a 2 Clav. e Pedale (chorale trio) play(help·info)
- Similar in texture to movements from the organ trio sonatas, this celebrating and lively concerto-like chorale prelude echos the "eternal joy and beatific light" of the last verse. The chorale prelude's progression through the keys of G, D, Due east minor, B minor, D and finally Yard, is reminiscent of Vivaldi concertos. The ii manual solo parts and pedal continuo are based on elements from the cantus firmus, which is heard in its entirety in the pedal part of the recapitulation.
- BWV 656 O Lamm Gottes unschuldig [Oh innocent lamb of God], 3 Versus (chorale partita) play(assistance·info)
- The beginning verse of this Good Friday hymn, is a subdued prelude in four parts based on the cantus firmus, which appears explicitly in the soprano line over the flowing quaver accessory; in the second verse the cantus firmus moves to the alto line and the quaver figures become more lively; in the final verse, the pedal finally appears to accept up the cantus firmus, beneath a four-part fugal counter-subject in triplets, starting time in a forthright athwart figuration, then in hammered repeated notes leading to an anguished chromatic passage, indicative of the crucifixion, and finally in peaceful flowing quavers.
- BWV 657 Nun danket Alle Gott [Now Thank We All Our God] (Leuthen Chorale), a 2 Clav. e Pedale, canto fermo in Soprano (cantus firmus chorale) play(help·info)
- This chorale prelude closely follows the model of Pachelbel, with a diversity of imitative elements in the lower parts, beneath the unadorned cantus firmus of the soprano line.
- BWV 658 Von Gott will ich nicht lassen [I will not forsake the Lord], Canto fermo in Pedale (cantus firmus chorale) play(help·info)
- The ornate three-part keyboard accompaniment is derived from the opening notes of the hymn and a separate "joy motif" that permeates the piece, exquisitely "winding above and around [the chorale tune] like a luxurious garland of amaranth."[23] Simply iv lines of the cantus firmus are heard in the tenor pedal, the chorale prelude closing with a seemingly timeless bong-like coda over a pedal point, perchance illustrating the final lines of the hymn, "afterward death nosotros will exist buried deep in the globe; when we have slept, we volition be awoken past God." In this "bong" coda, the note c1 sharp is heard vii times consecutively, within a fourth vocalization, outside of the three accompaniment voices. This is indicative of the German funeral bong.
- BWV 659 Nun komm' der Heiden Heiland [Come up now, Saviour of the heathen], a 2 Clav. eastward Pedale (ornamental chorale) in K small play(help·info)
- Over the quavers of the continuo-like "walking bass" in the pedal, the two inner parts move forrard meditatively in canon, beneath the florid and melismatic cantus firmus of "Nun komm, der Heiden Heiland". The beautiful melody, endlessly prolonged and never fully perceptible amongst the freely spiraling arabesques, evokes the mystery of the incarnation; it is matched past the perfection of the accompaniment.
- BWV 660 Trio super Nun komm' der Heiden Heiland [Come at present, Saviour of the heathen], a due Bassi e canto fermo (chorale trio) play(aid·info)
- This chorale prelude is unusually scored as a two-part invention for pedal and bass, with the ornamented cantus firmus in the soprano line post-obit the original hymn tune fairly closely. The opening ritornello, played imitatively in canon, contains the notes of the cantus firmus—g, g, f♯, b♭, a, thou, a, g— distributed between the two bass parts.[24]
- BWV 661 Nun komm' der Heiden Heiland [Come now, Saviour of the heathen], in Organo Pleno, Canto fermo in Pedale (cantus firmus chorale) play(help·info)
- Beneath a three-part keyboard fugue, typical of Bach's large calibration free organ fugues, with an angular quaver theme derived from the melody, the cantus firmus is heard in the pedal; the fugal theme, its counter-subject and their inversions are combined in numerous means in the grade of the piece.
- BWV 662 Allein Gott in der Höh' sei Ehr [Solitary to God on high exist honour], a two. Clav. due east Pedale, Canto fermo in Soprano (ornamental chorale) play(help·info)
- This chorale prelude, unusually marked adagio, is based on "Allein Gott in der Höh sei Ehr", a German version of the hymn Gloria in excelsis Deo. It has two ornate fugal inner parts over a continuo-like pedal, with a florid and melismatic cantus firmus in the soprano, its figurations reminiscent of those for obligato violin or oboe in the Weimar cantatas (due east.m. the sinfonia of Ich hatte viel Bekümmernis, BWV 21).
- BWV 663 Allein Gott in der Höh' sei Ehr [Alone to God on high be honour], a two. Clav. e Pedale, Canto fermo in Tenore (cantus firmus chorale) play(assist·info)
- The accompanying ritornello of this chorale prelude takes the form of a trio sonata, the two fantasia-similar upper parts, with their lively constantly varying contrapuntal quaver figurations, matched past a solid pedal continuo; the aria-like ornamented cantus firmus is heard in the long tenor part, with its quaver melismas and sighs.
- BWV 664 Trio super Allein Gott in der Höh' sei Ehr [Alone to God on loftier be honour], a 2. Clav. e Pedale (chorale trio) play(assistance·info)
- This is another chorale prelude similar to movements from the organ trio sonatas, inventive, scintillating, joyous and concerto-like; the two independent solo parts and the pedal continuo are based on elements from the cantus firmus, the first two phrases of which are only heard correct at the cease of the piece in the pedal before the last pedal point and coda. The chorale prelude is in 3 parts: six fugal statements of the ritornello; a series of brilliant violinistic episodes with suspensions, semiquavers and prolonged trills, punctuated twice past the ritornello in the minor mode; and a render of the ritornello over the cantus firmus ending in a long pedal bespeak.
- BWV 665 Jesus Christus, unser Heiland [Jesus Christ, our Saviour], sub communione, Pedaliter (chorale motet) play(help·info)
- In this choral prelude, each of the iv lines of the cantus firmus passes through the iv dissimilar voices, accompanied by a counter-subject field giving the musical colour advisable to that line: the carrying of the Cantankerous; God'south anger; Christ's biting suffering; and resurrection from the torment of Hell, for which Bach provides the longest and nigh elaborate pedal signal of the whole drove.
- BWV 666 Jesus Christus, unser Heiland [Jesus Christ, our Saviour], alio modo (chorale motet) play(help·info)
- This short chorale prelude for keyboard alone is a simple form of the chorale motet, with the cantus firmus once more passed betwixt parts and a different counter-subject for each of the 4 lines of the hymn.
- BWV 667 Komm, Gott, Schöpfer, Heiliger Geist [Come, God, the Creator, Holy Ghost], in Organo pleno con Pedale obligato (chorale partita) play(help·info)
- This chorale prelude on Martin Luther's hymn for Pentecost " Komm, Gott Schöpfer, Heiliger Geist " consists of two variations linked by a bridging interlude: the beginning is a miniature chorale prelude nigh identical to BWV 631 in the Orgelbüchlein, with an uninterrupted cantus firmus in the soprano line; in the second, the four lines of the cantus firmus are heard in the pedal, beneath a flowing imitative ritornello accompaniment on the keyboard.
- BWV 668 Vor deinen Thron tret' ich hiermit [Before your throne I now appear] (fragment) (cantus firmus chorale) play(aid·info)
- The three-part imitative accompaniment in the pedal and lower keyboard of this chorale prelude is based on figures derived from the four different lines of the melody and their inversions; each line of the cantus firmus itself is heard in the elementary soprano line, stripped of any embellishment, after its pre-imitation in the ritornello parts.
Variants [edit]
The original chorale preludes composed in Weimar are numbered BWV 651a, 652a, etc. When there are two or three earlier versions, the numbering uses other letters of the alphabet, for example BWV 655a, 655b and 665c. The variant BWV 668a is the consummate version of the chorale prelude that was published every bit an appendix to the Art of the Fugue, possibly to compensate for the unfinished final fugue, Contrapunctus Fourteen.[25]
Publication [edit]
The Great Eighteen were known throughout Deutschland past the turn of the nineteenth century, but only the terminal chorale prelude was available in print, in several editions, thank you to its reputation as the "deathbed chorale". Prior to the two Leipzig editions of Felix Mendelssohn in 1846 (which omitted BWV 664, 665, 666 and 668) and of Griepenkerl and Roitzsch in 1847 (which was consummate), the only other published chorale prelude of the Slap-up Eighteen was the brilliant trio Allein Gott BWV 664, which appeared in 1803 as i of the 38 chorale preludes in J. G. Schicht'south four-volume album. The two chorale preludes Nun komm' der heiden Heiland, BWV 659, and Schmücke dich, o liebe Seele, BWV 654, had even so get favourites. Mendelssohn and Schumann both venerated Schmücke dich: Schumann recalled Mendelssohn confessing after one performance that, "If life were to deprive me of hope and faith, this single chorale would replenish me with them both."[26] Following Mendelssohn'south popularization of these works, the definitive Bach-Gesellschaft edition, edited past Wilhelm Rust, was published in Leipzig in 1875.[27]
Transcriptions [edit]
Arranger and instrumentation | Published title | Original chorale prelude and BWV number |
---|---|---|
Carl Tausig (pianoforte) | Choralvorspiele für die Orgel von Johann Sebastian Bach: Für das Clavier übertragen von Carl Tausig. Berlin (dedicated to Brahms) | O Lammes Gottes unschuldig, BWV 656 |
Ferruccio Busoni (pianoforte) | Orgelchoralvorspiele von Johann Sebastian Bach: Auf das Pianoforte im Kammerstyl übertragen von Ferruccio Benvenuto Busoni, Leipzig, 1898 (dedicated to José Vianna da Motta) | Nun komm, der Heiden Heiland, BWV 659 play(help·info) ; Jesus Christus, unser Heiland, BWV 665; Komm, Gott Schöpfer, Heiliger Geist, BWV 667 |
Max Reger (pianoforte) | Ausgewählte Choralvorspiele von Joh. Seb. Bach: Für Klavier zu 2 Händen übertragen von Max Reger, Vienna, 1900 | Komm Heiliger Geist, Herre Gott, BWV 651; An Wasserflüssen Babylon, BWV 653b; Schmücke dich, o liebe Seele, BWV 654; Nun danket alle Gott, BWV 657; Vor deinen Thron tret ich hiermit, BWV 668 |
Arnold Schoenberg (orchestra) | Choralvorspiele von Joh. Seb. Bach instrumentiert von Arnold Schoenberg, Vienna, 1925 | Schmücke dich, o liebe Seele, BWV 654; Komm, Gott Schöpfer, Heiliger Geist, BWV 667 |
Wilhelm Kempff (piano) | Musik des Barock und Rokoko, für Klavier übertragen von Wilhelm Kempff, Berlin, 1932 | Nun komm' der Heiden Heiland, BWV 659 |
Leopold Stokowski (orchestra) | unpublished, outset performed on April 7, 1934 | Nun komm' der Heiden Heiland, BWV 659 |
Ralph Vaughan Williams (cello and strings) | unpublished; offset performed in London on December 28, 1956, in accolade of the 80th birthday of Pablo Casals | Schmücke dich, o liebe Seele, BWV 654 |
Selected recordings [edit]
- Michel Chapuis, in Bach – The Complete Organ Works (1966–1970)
- Bernard Foccroulle, Leipzig Chorales, Ricercar, RIC212 (2 discs). Recorded in 2002 on the large Silbermann organ in Freiberg Cathedral, Federal republic of germany, dating from 1714. The recording too includes the Preludes and Fugues BWV 546 and 547, and the Canonic Variations on "Vom Himmel hoch", BWV 769a.
- André Isoir, L'Oeuvre pour Orgue (fifteen discs), Calliope, CAL 3703–3717 (budget edition 2008). The chorale preludes, recorded in 1990 on the G. Westenfelder organ in Fère-en-Tardenois, are contained on the terminal ii discs, which are available separately.
- Ton Koopman, Schübler and Leipzig Chorales, Teldec, 1999 (two discs). Recorded on the Christian Müller organ in Leeuwarden, interspersed with a cappella versions of the chorales sung by the Amsterdam Baroque Choir.
Meet also [edit]
- List of compositions by Johann Sebastian Bach
Notes [edit]
- ^ Stinson 2001
- ^ Williams 1980, p. 124
- ^ Williams 2007, p. 79.
- ^ Stinson 2001, pp. 55–58
- ^ Stinson 2001, pp. 29–30
- ^ Stinson 2001, p. thirty
- ^ Stinson 2001, pp. 36–37
- ^ Yearsley 2002, pp. 2–6
- ^ Wolff 1993
- ^ Yearsley 2002, p. 4
- ^ Stinson 2001, p. 56, Philipp Spitta
- ^ Stinson 2001, p. 55, Manfred Bukofzer
- ^ Stinson 2001, p. 56, Harvey Grace
- ^ Stinson 2001, pp. 55–56, Albert Schweitzer
- ^ Stinson 2001, pp. 4–5
- ^ Stinson 2001, pp. 6–7
- ^ Stinson 2001, pp. 6–eight
- ^ Stinson 2001, pp. 8–15
- ^ Stinson 2001, pp. xvi–20
- ^ Stinson 2001, pp. xx–28
- ^ Acts 2:2
- ^ Stinson 2001, p. 80, Harvey Grace
- ^ Stinson 2001, p. 85, Philip Spitta
- ^ Williams 2003, p. 365–366
- ^ Stinson 2001
- ^ Stinson 2001, Chapter 5
- ^ Bach 1970
References [edit]
- Bach, Johann Sebastian (1999), Die Achtzehn Grossen Orgelchoräle BWV 651–668 und Canonische Veränderungen über "Vom Himmel Hoch" BWV 769. Faksimile der Originalhandschrift mit einem Vorwort herausgegeben von Peter Wollny, Laaber-Verlag . Facsimile of original manuscript, P 271 in the Berlin Land Library
- Bach, Johann Sebastian (1970), Organ Music. The Bach-Gesellschaft edition, Dover, ISBN0-486-22359-0
- Leahy, Anne (2011), J. South. Bach's "Leipzig" Chorale Preludes: Music, Text, Theology, Contextual Bach Studies, vol. iii, Scarecrow Press, ISBN978-0-8108-8181-5
- Stinson, Russell (2001), J.S. Bach's Great Eighteen Organ Chorales, Oxford Academy Press, ISBN0-19-516556-10
- Stinson, Russell (2006), The reception of Bach'southward organ works from Mendelssohn to Brahms, Oxford Academy Press, ISBN0-19-517109-eight
- Williams, Peter (1980), The Organ Music of J.Due south. Bach, Volume II: BWV 599–771, etc., Cambridge Studies in Music, Cambridge University Printing, ISBN0-521-31700-two
- Williams, Peter (2003), The Organ Music of J. Southward. Bach (second ed.), Cambridge University Press, pp. 336–386, ISBN0-521-89115-9
- Williams, Peter (2007), J.S. Bach: A Life in Music , Cambridge University Press, ISBN978-0-521-87074-0
- Wolff, Christoph (1993), The Deathbed Chorale: Exposing a Myth, Bach. Essays on his Life and Music, Harvard University Press
- Wolff, Christoph (2000), Johann Sebastian Bach. The Learned Musician, Oxford Academy Printing
- Yearsley, David (2002), Bach and the Meanings of Counterpoint, Cambridge University Press, ISBN0-521-80346-two
External links [edit]
- Great Eighteen Chorale Preludes: Scores at the International Music Score Library Project
- Free downloads of the complete Leipzig Chorales ("Bang-up Xviii") recorded by James Kibbie on the 1755 Gottfried Silbermann/Zacharias Hildebrandt organ in the Katholische Hofkirche: either search for private works or download the whole drove
Source: https://en.wikipedia.org/wiki/Great_Eighteen_Chorale_Preludes