I think the best music on any show is probably Mighty Boosh, though the theme is only like 10 seconds long and doesn't communicate much so that's why I didn't include it. But overall, best music on a show, ever. That death metal song about the killer grannies? The EELS UP INSIDE YA!/nu rave! song? FUTURE SAILORS? BOUNCY BOUNCY!?!?!!? Just amazing.
...And yeah the Are You Afraid of the Dark theme still fills me with dread...
THE MASK: THE ANIMATED SERIES theme is another fav...
http://www.youtube.com/watch?v=KzdR421Ekv8 ... reminds me of something Mr. Bungle would throw in the middle of a song as a joke..