Try the Citation Help LibGuide for general information and resources for citing in APA, MLA, or Chicago style. Your professor will specify which citation style you should use.
Typically, in the music discipline, Chicago Style is the preferred style. Check with your professor to make sure this is the style to format your paper in. Chicago Style provides citation examples in all formats including published scores, unpublished scores, online multimedia, concert reviews, sound recordings, and video recordings. For common formats, use the quick guide to citation style.
When writing, use the guidelines on how to express chords, dynamics, keys, pitches, and intervals. There are also guidelines on formatting titles of operas, songs, etc., instrumental works, recordings, and opus numbers.
The Chicago Manual of Style can be found online. It is also available in print at the Bartle Reference Desk: Z253.C57.
In some cases it may be preferable to use Kate L. Turabian's A Manual for Writers of Research Papers, Theses, and Dissertations, which applies the Chicago Manual of Style to those specific forms of writing.