'''Johann Sebastian Bach''' or ; (28 July 1750) was a German composer and musician of the Baroque period. He enriched established German styles through his skill in counterpoint, harmonic and motivic organisation, and the adaptation of rhythms, forms, and textures from abroad, particularly from Italy and France. Bach's compositions include the ''Brandenburg Concertos'', the ''Goldberg Variations'', the Mass in B minor, two Passions, and over three hundred cantatas of which nearly two hundred survive.Wolff (1997), p. 5 His music is revered for its technical command, artistic beauty, and intellectual depth.

Bach was born in Eisenach, in the duchy of Saxe-Eisenach, into a great musical family. His father, Johann Ambrosius Bach, was the director of the town musicians, and all of his uncles were professional musicians. His father probably taught him to play the violin and harpsichord, and his brother, Johann Christoph Bach, taught him the clavichord and exposed him to much contemporary music.Wolff (2000), pp. 19, 46 Apparently at his own initiative, Bach attended St. Michael's School in Lüneburg for two years. After graduating, he held several musical posts across Germany: he served as (director of music) to Leopold, Prince of Anhalt-Köthen, Thomaskantor in Leipzig, a position of music director at the main Lutheran churches and educator at the , where he served from 1723 to his death. He received the title of "Royal Court Composer" from Augustus III in 1736.Miles (1962), pp. 86-87 Bach's health and vision declined in 1749, and he died on 28 July 1750.

Bach had four composer sons. The music of one of them, Carl Philipp Emanuel Bach, was appreciated very highly from the later half of the 18th through the early 19th century, while Sebastian Bach's music was hardly known.

J. S. Bach's abilities as an organist were respected throughout Europe during his lifetime, although he was not widely recognised as a great composer until a revival of interest and performances of his music in the first half of the 19th century. He is now generally regarded as one of the greatest composers of all time.