Grove Music Online: Over 50,000 signed articles and 30,000 biographies contained in The New Grove Dictionary of Music and Musicians, 2nd edition (2001), The New Grove Dictionary of Opera (1992), and The New Grove Dictionary of Jazz, 2nd edition (2002).
Oxford Dictionary of Music (2nd Ed., rev. 2006): More than 12,500 entries on all aspects of music and music studies.
Oxford Companion to Music (2011): Over 8,000 articles on music and musicians with a special emphasis on contemporary composers.
Use Oxford Music Online to find authoritative information on
- instruments and notation
- forms and genres
- individual compositions