Q. What is Summon?
Summon is a search engine that provides a single starting point to find and access the majority of the University Libraries' resources — including books, ebooks, scholarly journals and articles, newspaper articles, dissertations and theses, videos, maps, manuscripts, music scores, digitized items, and more. A hosted service from Serials Solutions, the Summon knowledge base is combined with content from the University Libraries into one unified index.
Basically, it's the library's catalog
+ library digital collections
+ articles in the many indexes and databases that the library subscribes to (about 80% of the content)
If you're looking for articles about music and your search results in Summon are too broad or contain too many entires not related to what you are looking, try searching in music-specific databases like RILM or the Music Index.