Also, the larger Music Subject Guide has plenty of extra tips on doing music research & using database filters as a tool:
You can search these databases if you find that a broader approach is not enough. Think about your topic and what perspective might be most helpful. Might an education lens be useful if your population is children? Do you want to look at something more medical if your population is dealing with a physical health issue? Etc.
If you're looking for raw data to include in your research, there's plenty of places to go searching. A few recommendations are included here to help you get started.