Grove Music Online
Includes: The New Grove Dictionary of Music and Musicians, The New Grove Dictionary of Opera (1992), The New Grove Dictionary of Jazz, 2nd edition, The Norton Grove Dictionary of Women Composers (1994), The Grove Dictionary of American Music, 2nd edition (2013), and The Grove Dictionary of Musical Instruments, 2nd edition (2014).
A comprehensive database of music article citations spanning several decades and several hundred music journals. Primarily North American content.
The perfect source for those interested in teaching, educational research, and educational administration in Canada. Includes 400+ journals, with backfiles to the 1970s, with some articles about conducting.