Thats a cool idea for a party, imma use that, consider it stolen!
I love folk music, have plenty Dylan et al as it just seems to work well with a fire pit and a full moon. It can be fun to try and find quality FLAC files of classic music.
off-topic, but FLAC can be hard, not very popular, at least not here in Europe ; but you do realize that the WAV format is free? That is, if you have it on CD, you can simply rip it to wav and you have an exact CD-quality, 44kHz, 16bit copy (actually simply the CD file itself...)...the camp fire can provide the crackly scratchy sounds for ambience