Music Theory Online
Music Theory Online, a Journal of Criticism, is the refereed, electronic journal of the Society for Music Theory. Published several times each year, each volume of MTO includes features such as articles, reviews, commentaries, and analytical essays. In addition, MTO publishes announcements of upcoming conferences and calls for papers, a list of job opportunities, and abstracts of recently completed dissertations.
Grove Music Online
NGO should be your first choice for music research. Includes extensive bibliographies and composers' works-lists. Invaluable.
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The Music Index
Comprehensive source of music article citations, covering decades of research and hundreds of journals.
RILM Abstracts of Music Literature [online]
Online bibliography of citations, listing writings about music in all languages.