Music Periodicals Database (ProQuest) This link opens in a new windowMusic Periodicals Database is the only electronic index with abstracts to current music periodicals. New journals are added with the advice of the MPD Advisory Board. The database contains over 600,000 records, with complete runs of over ten important titles, such as the Journal of the American Musicological Society and Notes. MPD provides both current and retrospective coverage. IIMP offers the most extensive backfile available electronically, with over 235,000 records from 1874 to 1996.