Choral music is music which is written for musical ensembles, also known as "choirs" or "chorales" who perform together and often, but not always, sing church songs.
Regular Websites
The Choral Public Domain Library is the place to go to find free sheet music. The site has music organized by title and composers. You can also contribute music and funds to the library. There are also some translations available for some of the music. - Choral Public Domain Library
http://www.cpdl.org