Citation index begun in 1949, now with link-outs to full-text. Easy to use. Includes information on all aspects of music, and includes dance.
Music Periodicals Database
A music journal resource with more than half a million indexed articles, plus detailed abstracts and full text from 1874 to current, covering the scholarly to the popular.
JSTOR offers access to back-runs of some three dozen music journals, and includes information on dance. The "moving wall" means that current issues are NOT available from JSTOR, with a 3-7 year delay, on average).
RILM Abstracts of Music Literature
A citations-ONLY index to scholarly music literature in 200+ languages. Includes information about dance.