Understanding Music: Past and Present is an open Music Appreciation textbook co-authored by music faculty across Georgia. The text covers the fundamentals of music and the physics of sound, an exploration of music from the Middle Ages to the present day, and a final chapter on popular music in the United States. Also available from the Galileo: http://oer.galileo.usg.edu/arts-textbooks/1/.

Introductory music text written by Douglas Cohen for a course at CUNY Brooklyn College.

Basic music theory textbook by Catherine Schmidt-Jones. Also available from OpenStax: http://cnx.org/contents/KtdLe6cv@3.74:_GmJ4ENa@7/Understanding-Basic-Music-Theo.

Basics of music theory by Catherine Schmidt-Jones.

Music appreciation text by Catherine Schmidt-Jones. "Exploring Music Theories is a learning by doing course intended to help you explore the theories of music traditions that are not very familiar to you, or to compare different music theories to each other, or to explore music theory itself as an idea."

Music appreciation text on time and pitch by Catherine Schmidt-Jones.

Open Music Theory is an open-source, interactive, online “text”book for college-level music theory courses. It is online only and cannot be printed.