Cellist and Ethnomusicologist Jonathan Kramer of NC State has recently published, with colleague Alison Arnold, an interactive e-textbook in World Music/Music Appreciation, What in the World Is Music?
"What in the World is Music? is an undergraduate, interactive e-textbook that incorporates more than 300 video and audio links to music from around the world. The text investigates the nature and meaning of music as a universal human practice, while providing students with strong points of connection to the ways it affects their own lives. Merging the study of Western music tradition along with the ethnomusicological approach to non-Western music, and with a range of examples from both, What in the World is Music? explores how humans organize and experience sound, and the contexts in which music takes place."