Picander's cycle of 1728–29 is a cycle of church cantata librettos covering the liturgical year. It was published for the first time in 1728 as Cantaten auf die Sonn- und Fest-Tage durch das gantze Jahr (Cantatas for the Sun- and feastdays throughout the year). Johann Sebastian Bach set several of these librettos to music, but it is unknown whether he covered a substantial part of the cycle. This elusive cycle of cantata settings is indicated as the composer's fourth Leipzig cycle, or the Picander cycle (German: Picander Jahrgang).