With the South Park season premiere airing tomorrow, I thought it was a good idea to talk about the background music in the show. Jamie Dunlap does the background music for the show, and while he is probably not a well-known composer, he has had a ton of experience in the scoring world. Check out his extensive resume, and listen to his library of musical samples. Also, keeping relevant to South Park, check out the scene from the Season 9 episode entitled Ginger Kids that he also has on his website. The music is intense and captures the "horror" genre perfectly, and keeping with the quick production time of the show, it is quite possible that the orchestral music for that sequence was composed in just a few days, two or three tops.
While many of the episodes reuse and revamp musical cues (this is not an uncommon practice, hence many film composers having a library of musical samples), there are many other episodes with excellent original scores, most notably the Season 11 finale entitled The List.
The feature-length musical film also has amazing music, however, Dunlap was not doing the background music for the show during the time it was produced.