Why did Johann Sebastian Bach write music?
Answer:
It was a passion of his and his life revolved around classical music.
His father taught him to play violin and harpsichord.[4] His uncles were all professional musicians, whose posts ranged from church organists and court chamber musicians to composers. One uncle, Johann Christoph Bach (1645-93), was especially famous and introduced him to the art of organ playing. Bach was proud of his family's musical achievements, and around 1735 he drafted a genealogy, "Origin of the musical Bach family"