The Alf Clausen Orchestra

Wikisimpsons - The Simpsons Wiki

The Alf Clausen Orchestra, led by Alf Clausen, is the orchestra which plays the many music cues in The Simpsons. They have worked on every episode since "Treehouse of Horror". As of the 500th episode, "At Long Last Leave", the orchestra has composed and played almost 15,000 cues of music for The Simpsons.