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The following websites offer scores and audio files:

Art Song Central

Bach Cantatas

BachTrack

Byrd Choral Works

Chester/Novello

Choral Public Domain Library

Classical Net

Cyberbass.com

Everynote.com

IMSLP: Petrucci Music Library

Musicalion.com

Musicnotes.com

Online Musical Library

Opera, Arts Songs

Schubertline

Sheet Music Direct/US

Sheet Music Plus