(Sing a new song to the Lord), BWV 90.2, BWV190a, is a cantata by Johann Sebastian Bach. The work was written in 1730 in commemoration of the Augsburg Confession.
Bach adapted this cantata from , for the 200th anniversary of the Augsburg Confession. It uses a text by Picander, published in 1732 in part 3, in Leipzig. The first movement adapts words from Psalms 149 and 150. The second movement is based on the beginning of Martin Luther's German Te Deum, "".
The closing chorale was the third stanza of Luther's "" (1523).
The cantata's music is lost. Diethard Hellmann wrote a reconstruction in 1972.
The work has seven movements: