You can get help on the internet to learn choral parts. We generally recommend Cyberbass.com, which has synthetic instruments playing your part loudly and other parts quietly.
Choralia is excellent in that it renders your part in a robot voice; not very expressive, but it really helps you find your way.
learnchoralmusic.co.uk is a non-commercial site run by volunteers. It may be a bit more clunky in use, but you can download files and use them offline (you have to pay for that at Cyberbass). However, this site downloads “midi” music files, and you will probably need to find a “midi player” app for your computer, smartphone or tablet. There’s more help with this at the site’s help page.
Singers: if you’ve found a midi app which works well, please let us know.
A singer has drawn attention to the output of Musicwoofer on Soundcloud. These seem to be real performances sung by soloists, with the volume turned up on the voice of your choice. Good stuff. It’s a very well-built-and-debugged site, too. Worth searching.
You can get help with learning this term’s music, Vivaldi’s Gloria, on Cyberbass
Do you know anything better?
If you’ve got any more suggestions of good sites for practising either of these pieces, let us know and we’ll share them here.