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Johann Sebastian Bach (1685 - 1750)Inventions Nos. 1 -15, BWV 772 - 786 Sinfonias Nos. 1 -15, BWV 787 - 801Johann Sebastian Bach was born at Eisenach in 1685 into afamily of musicians. The early death of his parents left him in the care of his eldestbrother Johann Christoph, organist in Ohrdruf, where he remained for five years, untilbecoming a pupil at the Michaelisschule in L??neburg in 1700. Three years later he wasappointed court musician in Weimar, but a few months later moved to Arnstadt as organistat the Neuekirche. In 1707 he moved to a similar position at the Blasiuskirche inM??hlhausen, where he married his cousin Maria Barbara. The following year broughtappointment to Weimar as organist and chamber musician to Duke Wilhelm Ernst, one of thetwo rulers of the Duchy. In 1714 he was promoted to the position of Konzertmeister,consolidating still further his position as an authority on the construction of the organand his reputation as a performer. In 1717 he left the service of the Duke, who brieflyhad him imprisoned for his temerity in trying to leave Weimar, and took a more congenialposition as Kapellmeister to the young Prince Leopold of Anhalt-Cothen. Here he was ableto concentrate on secular music, since the Pietist practices of the court obviated theneed for elaborate church music. It was only the marriage of the Prince to a woman withoutmusical interests that induced Bach to seek employment elsewhere. In 1723 he signed acontract with the Leipzig authorities as Thomaskantor, with teaching responsibilities atthe Thomasschule, some of which could be delegated, and the charge of music in theprincipal city churches. By 1729 he had also taken the direction of the universitycollegium musicum, a society established earlier in the century by Telemann, godfather ofBach's fifth child, Carl Philipp Emanuel, and the Leipzig city council's first choice asThomaskantor. Bach remained in Leipzig as Thomaskantor until his death in 1750. Hisearlier years involved him in the composition of a quantity of church music, while thedemands of the collegium musicum were met by the re-arrangement of earlier instrumentalconcertos for one or more harpsichords. He continued to write extensively for the keyboardand to collect and edit his earlier compositions, particularly in the four volumes of his Clavier??bung.Bach's Inventions and Sinfoniaswere written about the year 1723 in Cothen, included in a collection of piecesdesigned for the education of his eldest son, Wilhelm Friedemann Bach, later employed asan organist in Dresden and then in Halle, before his final years in Berlin. It has beensuggested that Bach derived the title Invention, for the fifteen two-part compositions, BWV 772 - BWV 786, from the work of the Italian priestand composer Bonporti, a set of Invenzioni for violin and keyboard published in 1712 andknown to Bach. The term, however, was not new to Bonporti, as it occurs from the sixteenthcentury onwards to describe a variety of instrumental compos