LG Trax CU575

My buddy just bought this phone as an upgrade to the CU400 he had, and I like it well enough that I think I'll go pick one up for myself, along with a Sandisk memory card. Now, from what I understand from reading various materials, it's possible to listen to music from the phone's media player via a Bluetooth headset. My buddy has a Plantronics 220 earpiece paired with the phone (this is the type that only goes in one ear, it is not stereo) and I couldn't figure out from reading the manual and playing with the phone exactly how to get the music to play over the headset. How can I accomplish this? Do I need a specific brand/type of Bluetooth handsfree device? I want to be able to do this, it's one of the main reasons I'm considering this purchase, the other being that this phone can hold more songs/video/pictures than my own CU400.