Perhaps better known is his Mass in B Minor.  
He once challenged the French harpsichordist Jean Louis Marchand to a musical contest only to have the Frenchman fail to show up.  His numerous church cantatas include "Sleepers Awake" and "O joyous Light," and he used six of those linked cantatas to form his Christmas Oratorio.  He once walked 200 miles on foot to hear the organist Dietrich Buxtehude, shortly after which he composed his Toccata and Fugue in D Minor.  Perhaps better known is his Mass in B Minor.  FTP, name this composer of the St. Matthew Passion and the Goldberg Variations.
He once challenged the French harpsichordist Jean Louis Marchand to a musical contest only to have the Frenchman fail to show up.  
Johann Sebastian Bach (prompt on just last name; must have both initials)