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:
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.