* Grove Music Online: A subscription-based online encyclopedia with detailed information on classical music composers, including scholarly articles, biographies, and bibliographies.
* Baker's Biographical Dictionary of Musicians: A comprehensive print encyclopedia of classical music composers, including detailed biographies and lists of works.
* The Oxford Companion to Music: A concise and accessible one-volume encyclopedia of classical music composers, including biographies, a glossary of terms, and a timeline of musical history.
* The Norton/Grove Dictionary of Music and Musicians: A multi-volume print encyclopedia of classical music composers, including detailed biographies, discographies, and bibliographies.
* Wikipedia: A free online encyclopedia with information on classical music composers, including biographies, discographies, and links to further resources.
* Classical Music Listening Guides: A website that provides detailed listening guides to classical music compositions, including information on the composer, the composition's history, and its musical structure.
* BBC Radio 3: A British radio station that broadcasts classical music 24 hours a day, and their website has a wealth of information on classical composers, including interviews, performances, and podcasts.
* Gramophone Magazine: A monthly British magazine that covers classical music, and their website has a wealth of information on classical composers, including interviews, reviews, and podcasts.