Maybe it's just my old Plantronics Explorer 220 Headset but I can't figure out how to use it to listen to music. I can only use it while on calls...my headset doesn't even ring when somebody calls, the phone does. The bluetooth headset rang in my ear with my 3 year old LG flip-phone though.
My phone is the Moto Droid.
Amazon.com: Plantronics Explorer 220 Bluetooth Headset (Black): Cell Phones & Service