BBC
Bbc: Bitesize: Gcse Music
GCSE Music provides links to a variety of music topics including composers, composing music, music theory, music technology, performing and evaluating music, music styles, world music, and traditional music from the UK.
Other
Art Criticism: Four Stages of the Critical Process
Provides a brief description of each stage of art criticism using music as an example: description, analysis, interpretation, and judgement.