Note: You won't come up with much if you search for "vocal pedagogy" in the library catalog. Try this instead: "singing--instruction and study."

More helpful subject headings for searching the catalog:

Bel Canto.

Larynx.

Singing.

Singing--Breath control.

Singing--Diction

Singing--History.

Singing--Instruction and Study.

Singing--Interpretation (Phrasing, dynamics, etc.).

Singing--Methods.

Singing--Periodicals.

Singing--Physiological aspects.

Vocal cords.

Voice.

Knowing call number ranges helps simplify physical browsing in the library stacks.

Call number ranges for vocal pedagogy resources:

Books: 782.00 - 784.96

Scores: M1497 - M1619

If you're looking for International Phonetic Association (IPA) translations of songs, here is a canned search to help you.  You can find many of these books in the 782 call number range.