Use music encyclopedias to find background information on musicians, instruments, styles of music, and much more. They are a great place to start your research. The entries in scholarly encyclopedias offer an overview of the topic, provide dates, list the pieces a musician composed, and include additional citations for expanding your research.
The two offered above are great resources. If you are curious, you can find other online encyclopedias in Search It. Use advanced search and do these things: