Where can I find the music Walter Murphy composed on Buffy the Vampire Slayer?

Walter Murphy was the original composer for BtVS, and the music was kind of eerie. I liked it. But I can't find it anywhere. I can find the music written by every other composer on the show, but Murphy's work is nowhere to be found. I'm highly disappointed by this, I didn't think there was any piece of music that hadn't been made readily available in some capacity. Is there ANYONE out there who can help me out?