Ich weiß, daß mein Erlöser lebt, TWV 1:877
History. A manuscript copy from the 18th century by Bach's student Heinrich Nikolaus Gerber identified Bach as the composer of the work, and on this basis it was published as Bach's in the 19th century, and given the number 160 in the "Bach-Werke-Verzeichnis". Other 18th-century manuscripts attributed the work to Telemann: authenticated as a work by this composer the piece was assigned the number 1:877 in the "Telemann-Werke-Verzeichnis". It is one of the works that Bach had copied out so that he could perform it  as part of his employment in Leipzig. Structure. The piece is a solo cantata with lyrics by Erdmann Neumeister. It is scored for solo tenor voice, violin, bassoon, and basso continuo. It has five movements (all in the key of C major), alternating between arias and recitatives.