if you are looking for some new music for your aerobics classes... http://www.folkways.si.edu/albumdetails.aspx?itemid=2638
this is CRAZEE!
i was just browsing around the smithsonian folkways recordings site looking for music and came across some of the odder stuff. and they do have some odd things -- i also found a record just of the beeping of old satellites, like sputnik.
but folkways is great if you are interested in world music, folk, american traditional music, blues, etc. -- it's not just weird records.