BACH motif

From Academic Kids

In music, the BACH motif is the sequence of notes B flat, A, C, B natural.

This four-note motif has been used by a number of composers, usually as a homage to Johann Sebastian Bach. The first known example, however, is in a piece by Jan Pieterszoon Sweelinck—it is possible, though not certain, that he used it in homage to one of Johann Sebastian's ancestors, many of whom were themselves musicians.

The possibility of being able to spell the surname Bach in this way comes about because in German B indicates what in English is called B flat, while H indicates what in English is called B natural.

J. S. Bach himself used it as a fugue subject in the final part of Die Kunst der Fuge (BWV 1080), a work he did not complete before he died in 1750. It appears in passing in several of his other pieces, such as at the end of the fourth of the canonic variations on "Vom Himmel Hoch", BWV 769. Its appearance in the penultimate bar of the Kleines harmonisches Labyrinth, BWV 591, is not thought to be very significant and the work may even be spurious (Johann David Heinichen has been suggested as a possible composer). It shows up in the St Matthew Passion in the section where the chorus sings "This man was God's own son most truly." In many pieces, while the exact notes B-A-C-H are not played, a transposition of the motif is used (a note sequence with the same intervals: down a semitone, up a minor third, down a semitone).

A fugue for keyboard in F major by one of Bach's sons, probably either Johann Christian Bach or Carl Philipp Emanuel Bach, exists using the motif, but it was not until the 19th century when interest in Bach was revived that the motif began to be used with any regularity.

Perhaps because it was used by Bach himself in a fugue, the motif is often used by other composers in fugues or other complex contrapuntal writing.

Works which prominently feature the BACH motif include, in chronological order:

The motif features in passing in a number of other works including Arnold Schoenberg's Variations for Orchestra (1926-28) and his String Quartet No. 3 (1927), Krzysztof Penderecki's St Luke Passion, and Johannes Brahms' cadenza for the first movement of Ludwig van Beethoven's Piano Concerto No. 4.

Other signature motifs include:

These are possible because the German for E flat is "Es".
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