Most overlooked and incredibly good? Wow, where do you start... you can begin this discussion with entire genres of music that have been overlooked, because they get zero radio play. For example, Lounge, Downbeat, Electronica, Indie, Global et. al., are all overlooked and chalked with outstanding bands. I recently came across an artist named Tommy Guerrero, who is blowing my mind with his music. Guided By Voices is great example of a band that was overlooked by mainstream radio and yet is one of the most talented bands to come around in the past twenty years. Same applies to Morphine... doesn't get much better IMO. Some of the great Athens Georgia bands hid behind the shadows of REM, but are marvelous. Guadalcanal Diary was mentioned, but I would throw in bands like Love Tractor, Widespread Panic, Pylon, Chickasaw Mudd Puppies and Ravenstone as well.