Study of cultures and the music they play. She has some awesome CDs with stuff like Pygmy music which is all acapella, with about 20 or so different people each contributing a different sound. Sounds almost like a cacophony to my ears, but when you listen closely and with the right frame of mind it's pretty beautiful stuff. Ethno = culture, Music = well music, ology = study of. Just like Ethnobotany is the study of cultural usage of plants (like Ayahuasaca, Psilocybe, Cannabis, etc).