Johann Sebastian Bach (1685 – 1750) is one of the most important figures (if not the most important and influential figures, in all of Western Music. Yet, as often can be the case, by the end of his career, many considered him “old hat”. At the end of the Baroque period, the Classical style. Haydn was nearly an adult, and Mozart and Beethoven would be dominating the 2nd half of the 18th century.
(He) was a German composer, organist, harpsichordist, violist, and violinist 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. – Donald Grout, (1980), A History of Western Music.