What can you expect in Oxford Music Online? Think Wikipedia, but better. You can get lots of big-picture, overview information here. It will help you get oriented before you dig into your topic.
This is the main search box from the library's homepage.
What can you expect to find here?
You can request access to just about any book, article, or physical media ever created--you just have to know about Interlibrary Loan. This service lets you borrow materials from other libraries, for no cost to you.
Plan Ahead: Books and physical media usually take about 5-7 business days to arrive, and articles / chapters usually take 2-3 business days to be emailed to you.