I migrated from the G1 to G2, and have been having this problem since day 1. I use my phone to stream music to my car stereo via bluetooth all the time, and with the G1 it worked flawlessly; however, the G2 music quality sounds like it's playing on an AM radio station. T-mobile tried to help for weeks, and eventually replaced the phone. Got the new one yesterday, and it sounds the same. Just to make sure, I had a friend listen and compare, and he let me know I'm not just imagining it. It sounds terrible. I love the phone, but I'm tired of switching the sim card around just to drive my car. Any help at all?