I'm looking for some "scholarly" sources for reports for my Music class. We're studying Music History, specifically sacred vs secular classical music.
If you have access to either Jstor or the Grove Dictionary of Music, those are the first places to go.
The Grove Dictionary of Music and Musicians is available online at the Oxford Music Online web site. The Grove Dictionary has been published continuously since the year 1878. Subscriptions are not affordable to individuals, but certain university and public libraries pay for a subscription, so check with libraries in your area.
The Music Index also provides abstracts to articles about music that you can then find in a local library.