Frequently Used Resources
The Allen Music Library has a wealth of resources on music of all types -- not just the usual western composers like Bach and Beethoven. If you need book-length information about a genre/style, here are some starting points:
Photo to the upper right: Head of the Allen Music Library, Laura Gayle Green's, father and family friends at a house jam in the early 1970s.
Finding journal articles on these topics (using Old-time music as an example):
Photo on the right: House jam in the 1940s or 1950s. Laura Gayle Green's uncle on fiddle and his cousin on banjo.