If you happen to be in Texas I would recommend The Spazmatics, especially at Cedar St. in Austin on a Wednesday night. Also, if you are in Texas ... leave now for at least the next 3 months ... it is about to get miserably hot there.
If you live in a large metropolitan area, you may want to check out if someone is showing the film Once. It is a tremendous reminder as to why music and film are wonderful things. I highly recommend catching this one in the theater, where the music can bathe you in the experience. Here is one of the songs from the movie played outside Sundance (and by "from" I mean totally a part of the movie in every way):
If you are not in a major metro, then you may want to add this flick to your queue now, so you don't forget.