bach

In music, the BACH motif is the sequence of notes B flat, A, C, B natural. Bach's use of this cruciform melody in reference to himself extended to its inversion, retrograde, retrograde-inversion, and all transpositions thereof. 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 in the 17th century—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.
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Johann Sebastian Bach (21 March 1685 O.S. –  28 July 1750 N.S.) was a prolific German composer and organist whose sacred and secular works for choir, orchestra, and solo instruments drew together the strands of the Baroque period and brought it to its ultimate maturity. Although he introduced no new forms, he enriched the prevailing German style with a robust contrapuntal technique, a control of harmonic and motivic organisation from the smallest to the largest scales, and the adaptation of rhythms and textures from abroad, particularly Italy and France.
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n. bourn, burn, small stream, brook, rivulet

n. Bach, Johann Sebastian Bach, (1685-1750), German composer and organist

n. Bach, family name; Johann Sebastian Bach (1685-1750), German composer and organist, father of a line of distinguished musicians

n. Bach, Johann Sebastian Bach, German composer and organist (1685-1750)