IUP is not the only institution with a music collection. Both public and academic libraries hold materials which you may find useful.
Some public libraries, like the Library of Congress and the New York Public Library, have both general and specific collections which will suit your needs. Below are links to these institutions where you can conduct either a refined search for specific material, or also a broad search on a given topic.
Then there are special libraries, which can be found at public libraries, academic libraries, or as individual stand-alone institutions. This type of library has a collection-specific focus.
Below are links to some highly regarded special libraries. Visit these sites to refine your research.