Johann Sebastian Bach's Magnificat, BWV 243, is a musical setting of the biblical canticle Magnificat. It is scored for five vocal parts (two sopranos, alto, tenor and bass), and a Baroque orchestra including trumpets and timpani. It is the first major liturgical composition on a Latin text by Bach. In 1723, after taking up his post as Thomaskantor in Leipzig, Bach set the text of the Magnificat in a twelve movement composition in the key of E-flat major. For a performance at Christmas he inserted four hymns (laudes) related to that feast. This version, including the Christmas interpolations, was given the number 243.1 (previously 243a) in the catalogue of Bach's works. Likely for the feast of Visitation of 1733, or another feast in or around that year, Bach produced a new version of his Latin Magnificat, without the Christmas hymns: instrumentation of some movements was altered or expanded, and the key changed from E-flat major to D major, for performance reasons of the trumpet parts. This version of Bach's Magnificat is known as BWV 243.2 (previously BWV 243). After publication of both versions in the 19th century, the second became the standard for performance. It is one of Bach's most popular vocal works. History In Leipzig, the Magnificat was regularly part of Sunday services, sung in German on ordinary Sundays but more elaborately and in Latin on the high holidays (Christmas, Easter and Pentecost) and on the three Marian feasts Annunciation, Visitation and Purification. Bach's tenure as Thomaskantor in Leipzig Apart from an early setting of the Kyrie, on a mixed Greek and German text (BWV 233a), all of Bach's known liturgical compositions in Latin were composed during his tenure as Thomaskantor in Leipzig, from 1723 until his death in 1750. Compared to Lutheran practice elsewhere, an uncharacteristic amount of Latin was used in church services in Leipzig. An early account of Bach showing interest in liturgical practices in Leipzig dates from 1714, when he noted down the order of the service on the first Sunday in Advent during a visit to the town. At the time Johann Kuhnau was the Cantor in Leipzig. When Kuhnau died in 1722, one of the candidates applying for the post of Thomaskantor was Christoph Graupner, a former pupil of Kuhnau, who reused a Magnificat he had composed for Christmas 1722 as an audition piece in January 1723, three weeks before Bach presented his