Rehearsal Aids - helpful for learning your notes
Choraline: www.choraline.com/
Over 1,000 Voice Part Rehearsal Recordings for Choral Singers. Priced service - many different formats offered
Cyberbass: cyberbass.org/Major_Works.htm
Free online files - this site covers many major works. Also offers links to purchase CDs, scores etc but is USA based
John Fletcher: johnfletchermusic.org/
Nearly comprehensive collection of online files. Free access if the work is out of copyright. Subscription required if in copyright. Free registration required.
Choral Music Tutor: choralmusictutor.com
"I wanted Choral Music Tutor to be easy to use, so you just need a few mouse clicks and the music is playing, and you can adjust things while it's playing." Chris Hills, founder. Requires you to locate a MIDI file first. Suggested source for these is learn choral music (see below)
Learn Choral Music learnchoralmusic.co.uk
This is a large resource of MIDI files which you can access in various ways
Need help with reading music?
Making Music have produced a short and simple guide. Click here for a copy.

