The Open Goldberg Variations (Johann Sebastian Bach, BWV 988), played by Kimiko Ishizaka on a Bösendorfer 290 Imperial piano, are free to download and share.
Art and Music Since 1945 (CC BY)
This open website is used for a course on Art and Music since 1945 offered at The Ohio State University. The website contains a collection of biographies of artists and musicians, a sample syllabus, and assignments. Its companion textbook is meant to be A Quick and Dirty Guide to Art, Music, and Culture, which is posted below.
An open textbook by The Ohio State University that discusses art and music in the context of popular culture. It is meant to work with the open course Art and Music Since 1945, which is posted above.
Acoustics (CC BY)
A set of four videos on acoustics.