There are several sources of librettos available:
Nico Castel's Opera Libretti Series includes the original texts, word-by-word translations, and IPA transcriptions for entire opera libretti. They can be found in Music Reference and have call numbers ML 48 through ML 50.
Pronunciation Guide for The Lieder Anthology
Pronunciation Guide for The French Song Anthology
Newly Arranged Chinese Folk Songs, by Mei Zhong
Traditional and Modern Chinese Art Songs, by Mei Zhong
Exploring art song lyrics : translation and pronunciation of the Italian, German & French repertoire by Jonathan Retzlaff
Italian Song Texts from the 17th Through the 20th Centuries
Schubert's Complete Song Texts: With IPA Transcriptions, Word for Word Translations and Commentary by Beaumont Glass
Richard Strauss' Complete Song Texts by Beaumont Glass
Arie Antiche by Alessandro Parisotti, with CDs
Translations and Annotations of Choral Repertoire, by Jeffers, Paine, Nash, and Jacobson
ML53.8 .J44 1988 (Music Reference) and Compact Disc 19700 (Hebrew texts)
Vol. 1 Sacred Latin Texts (includes information about liturgy)
Vol. 2 German Texts
Vol. 3 French and Italian Texts
Vol. 4 Hebrew Texts
Album liner notes often have translations too. These can be found in the Compact Disc collection of Education, Music and Media or at Naxos Music Library.
Users are encouraged to search for items beyond University Libraries' catalog via RILM Abstracts of Music Literature and WorldCat. Materials not available in print or online may be requested through Interlibrary Loan. Please allow up to seven days for electronic delivery and up to fourteen days for delivery of physical items.