According to the obituary written by his son Carl Philip Emmanuel and his former pupil Johann Friedrich Agricola, Johann Sebastian Bach composed five Passions, including ?one for two choirs? (the St Matthew Passion). However, only two of them have survived in their entirety. A third one, the St Mark Passion, has given rise to various reconstructions, and the last two, if they at all existed, are irretrievably lost. Of the two Passions that have come down to us, the St John Passion was the first to be composed; Bach had it performed for the first time in the St Nicholas Church less than a year after taking up his post in Leipzig, on 7 April 1724 (he had taken the liberty of announcing it to the St Thomas Church, which earned him a reprimand; he got away with a somewhat ironic letter of apology). The work was again performed the following year, this time at St Thomas?, and most likely on further occasions in 1732, 1739 and 1749, with various revisions.