johann sebastian bach (31 march [o.s. 21 march] 1685 – 28 july 1750) was a german composer and musician of the late baroque period. he is known for his prolific output across a variety of instruments and forms, including orchestral music such as the brandenburg concertos; solo instrumental works such as the cello suites and sonatas and partitas for solo violin; keyboard works such as the goldberg variations and the well-tempered clavie…