I saw the MeFi thread on Jellyfish, an early 90s power-pop band that never really became successful. They are fucking brilliant. Here's a great live performance of their song New Mistake. Their most well-known song is probably Joining A Fan Club, which was later covered by Puffy AmiYumi a Japanese pop rock band. This cover was produced by Andy Sturmer who was the original frontman of Jellyfish. Puffy also recorded the theme tune for Teen Titans and Andy Sturmer wrote the theme tune for Ben 10. Puffy AmiYumi have also done a bunch of Japanese anime theme songs, none of which I have actually heard of. I feel slightly pathetic for just posting something that half of the users on here have probably seen, but I have not been able to get these songs out of my head.