posted 11-03-1999 09:11 AM
The tune in the car was "Rigors" by the Digginlilies, which I find pretty amusing since the only song in the movie didn't make the soundtrack. The tune is on their CD "Popula." Here's their website:
http://juicytemples.com/digginlilies/frame/index.html And here's an mp3 of the song:
http://juicytemples.com/dl/rigors.mp3
Here's a big ugly link to CDnow's BWP soundtrack page (or just go there and do a search):
http://www.cdnow.com/cgi-bin/mserver/SID=171446619/pagename=/RP/CDN/FIND/album.html/ArtistID=BLAIR+WITCH+PROJECT+%28SOUNDTRACK%29/DDCN=SD-67604+120+2
If you're referring to the music at the end, that's original music by Antonio (Tony) Cora, and it's called "The Cellar." You can hear a sample at the above website (it did make the soundtrack).
If you're referring to the "Gilligan's Island" theme, wake up. The war is over. 
There. Hope that helps. 
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Roland