This is another tough one. I can immediately think of some favorite groups, but these are not bands per se to me. Tight harmonies and some slick dance moves does not make a band. I define a band as folks playing instruments and writing songs.
In reviewing my music collection, I don’t think I have a favorite band. There are bands that I like–Led Zeppelin, Guns N’ Roses, Nirvana, Earth, Wind and Fire, R.E.M.–but I don’t view any as an absolute favorite. I could cheat and go with Prince and the Revolution. No, I think I’ll just pull a fave song from a band.