I just type in "walt" and hit go. If you type in Disney you get all kinds of stuff thats irrelevent like music from old disney movies. "Walt" always got me stuff like Illuminations Reflections of Earth, Tapestry of Nations, and park rides. Its like everything else; its all in timing. Last I checked I had over 200 different disney selections. Everything from actual ride dialogue to the different monorail dialogues to Pirates of the Caribbean movie & ride music to Kingdom Hearts movies to classics like Its a Small World. I got all the Epcot music from there. Lots of classical area music and fountain music too. I have a 120 Gig harddrive with massive DDR. No problems for me.
Ive heard of bearshare but never tried it yet. It probably wouldnt hurt to have both, just be careful. When your on filesharing your computer is wide open to attackers. I dont go on much, then just grab a few songs and disconnect. I usually let anyone who starts a download from me finish before I disconnect.