They Might Be Giants are fun and there's a decent chance you've heard them with out realizing (Several theme songs including Malcolm in the Middle some of the music from Coraline, several of the songs used in Tiny Toon Adventures, and the version of Istanbul not Constantinople that people actually know about). They've put several of their official videos on youtube, particle man is a good example of classic TMBG, can't keep Johny Down is one of there better new adult songs. They've also recently created an education children's album called Here Comes Science which might be good for young rationalists.