"The choir sang 'Jesu Joy of Man's Desiring'"

 This is the tenth movement from Cantata no. 147 by Johann Sebastian Bach. The underlying melody was composed by Johann Schop, a violinist and composer. Bach borrowed the melody and worked it into his piece. The most commonly heard English text is a loose translation of the German by Robert Bridges: "Jesu, joy of man's desiring, Holy wisdom, love most bright; Drawn by Thee, our souls aspiring, Soar to uncreated light."

Jesu, Joy of Man's Desiring (from Cantata No. 147) on Spotify