M 1506 - M 1509 Dramatic collections, vocal score
M 1530 - M 1609 Secular choruses
M 1612 Secular songs, vocal scores
M 2023 Sacred choruses, vocal scores
The Owner's Manual to the Voice: a guide for singers and other professional voice users by 
Choral Pedagogy by 
The Craft of Singing by 
Singing and Teaching Singing by 
Singing by 
On the Art of Singing by 
The Art Song: A Research and Information Guide by 
Head First: the language of the head voice : a concise study of learning to sing in the head voice by 
The Versatile Vocalist: singing authentically in contrasting styles and idioms by EASMES - Early American Secular Music and Its European Sources, 1589-1839: An Index
"This is a series of indexes derived from a data base of musical information compiled from primary sources covering the 250 years of the initial exploration and settlement of the United States. It consists of over 75,000 entries that are sorted by text (titles, first lines, recitatives, chorus and burden), by music incipits (represented in scale degrees, stressed notes and interval sequences), with additional indexes of names and theater works. Now in electronic format, the data can be fully searched, not only for initial strings, but also for internal words and melody sections."
The National Tune Index by