Jesus, my joy

Jesu, Joy of Man's Desiring (Jesu, Beleibet Meine Freude), by Johann Sebastian Bach.

Da such ich meine Freude = I (shall) look for my joy there.

Traditionally it is pronounced as in Latin (YEH-zoo), but as this text is not the original I see no problem with singing it however you see fit; I have even heard the first word changed to "Jesus," which does make more sense than using Latin. The original text is "Jesus bleibet meine Freude" and the movement is taken from Bach's cantata BWV 147 "Herz und Mund und Tat und Leben."

Bach wrote quite a lot of songs, here is a list of all of them:

http://en.wikipedia.org/wiki/List_of_songs_and_arias_of_Johann_Sebastian_Bach

If you are looking for the most famous movements in his composition, I would probably say Air (from BWV 1068), Toccata in D Minor (from BWV 565), Jesu Bleibet Meine Freude (from BWV 147) and Minuet in G (BWV Anh. 115). As for his most famous whole compositions, probably the Mass in B Minor (BWV 232), the St. Matthew's Passion (BWV 244), the Brandenburg Concerti (BWV 1046-1051), the Goldberg Variations (BWV 988), and several cantatas (like 140, 147, 8, 211 and 106).

Bach's works are so vast that giving you a mere five tracks seems to be unfair to the essence of the composer. Start with some discs of "The Best of Bach" or similar titles, and slowly work your way through the works of this amazing composer. I just gave you small taste here.