Die Musik in Geschichte und Gegenwart (MGG) is a general encyclopedia of music. MGG is encyclopedic in the true sense of that term: it offers in-depth articles on every aspect of music as well as many related areas such as literature, philosophy, and visual arts. MGG Online contains the second print edition of MGG, published from 1994 to 2008, as well as current, continuous online updates and additions.
RILM Music Encyclopedias is a continually expanding curated full-text collection that currently comprises 57 titles published from 1775 to the present. Its content spans various fields and subject areas of historical musicology, ethnomusicology and theory, with focus on topics ranging from popular music, opera, instruments, blues and gospel, to recorded music and women composers.