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It is helpful to review this print resource as well:
Collection-level cataloging : bound-with books / Jain Fletcher. Santa Barbara, California : Libraries Unlimited, c2010.
With a lot more cataloging options (including separate cataloging of each bound-with monograph item) than the title suggests. Some mention of music, but mainly discussing monographic books bound together into volumes.
A good general, and detailed, introduction to various bound-with cataloging problems /and multiple solutions.