BWV 19. For that sacred work Picander had published a libretto in 1725, but the text used by Bach for his 1726 cantata is an extensively reworked version of the 1725 print. Early 1727 the composer and the librettist appear to have collaborated on further cantatas, and possibly the St Matthew Passion. Later in 1727, and in early 1728, there are two further secular cantatas composed by Bach on a Picander libretto. First publication of the 1728–29 cycle In June 1728 Picander produced the first installment of his 1728–29 cycle of cantata librettos. In its introduction he invited Bach to set the texts. No response of Bach has been recorded to this first set of 16 cantatas. If he set any of the librettos, the music has been completely lost. Contrary to his 1724–25 cycle the installments were now in quarterly submissions of 16 to 19 cantata librettos each. These also include cantata text not usable in a Leipzig context (cantatas for the periods of Advent and Lent when in Leipzig a tempus clausum was observed), and cantatas for occasions not occurring in the period for which the cycle was planned (e.g. Christmas I and Epiphany VI). The start of the cycle was exceptional: the publication opened with a libretto for St. John's Day, 24 June 1728, followed by a cantata text for Trinity V, which in 1728 fell on 27 June. Only from the second installment, with cantata texts for occasions from St. Michael's Day (29 September) to the end of the year a few settings by Bach are extant, the oldest of these a setting for Trinity XXI (17 October 1728). Bach's setting of the first cantata of the second installment was only premiered in 1729. In total, for the complete cycle of 70 cantata librettos, nine settings by Bach are known, and only six of these fully extant. In Lent 1729 at the latest Bach and Picander were collaborating on the St Matthew Passion libretto, which for some movements derived from Picander's 1725 Erbauliche Gedanken publication. It is not known whether the St Matthew Passion was premiered in 1727 or 1729. Further publications and republications From 1727 Picander was publishing his Ernst-Schertzhaffte und Satyrische Gedichte, large collections of serious, jocular and satirical poetry. All of its volumes, most of these reprinted several times, and reworked editions, up to its fifth and last volume published in 1751, contained