Reference works such as dictionaries, encyclopedias and handbooks are useful for definitions of terms and for brief factual information. Dictionaries and encyclopedias will provide you with:
This page has a selection of dictionaries and encyclopedias. To find further examples use the library 'Search'. Type your topic keyword/s for example: music dictionaries or popular music encyclopedias or jazz encyclopedias.
The Oxford Music Bibliographies feature peer reviewed annotated bibliographies which are also a useful reference resource. For example: Baroque music, Jazz, Medieval music, Romanticism as well as Rap/Hip Hop, Salsa, Sonata, Symphony and Video Game Music.
The African American almanac has a comprehensive article on Blues and Jazz, which which is part of the Gale Reference Library.
Online encyclopedias
It is possible to go directly to particular regions as illustrated in a selection here:
More encyclopedias on databases
Encyclopedias on specific subjects
Die Musik in Geschichte und Gegenwart : allgemeine Enzyklopädie der Musik.
Bibliographies include English sources.