Begin your research using reference resources to get an overview of a topic, definitions, authoritative names in the subject field, major dates or timelines, bibliographies leading to additional resources, and keywords or vocabulary terms to use for database searching.
Different types of reference sources include dictionaries, encyclopedias, bibliographies, companions and handbooks.
"A collection of songs from the musical stage, categorized by voice type. The selections are presented in their authentic setting, excerpted from the original vocal scores." There are multiple volumes for each voice type. Contents: Soprano (5 v.) -- Mezzo-soprano/Alto (1 v.) -- Mezzo Soprano/Belter (3 v.) -- Tenor (5 v.) -- Baritone/Bass (5 v.) -- Duets (2 v.)
The Canadian Encyclopedia, updated online by Historica Canada, includes the former Encyclopedia of music in Canada, still the most authoritative first point of reference for researching the music of Canada. Search musical theatre as a topic, or musicals or performers by name.
Continuum encyclopedia of popular music of the world. Music Ref. ML102 .P66 C66 11 vols.
Oxford Reference Online - Performing Arts