Live music in Milwaukee

Where do you go to see the best live music in Milwaukee? I think it's easier to find a great band in Milwaukee and then follow them around. Some Milwaukee venues are not the best for sound, others are better known for solid bartenders, great drinks and such. Consider Myspace, find a band that you like, and then follow them around Wisconsin. I don't agree that the booking agent for a club will bring in the best bands. You follow that route and you end up seeing some really crappy cover bands.