The John Fletcher practice files are generally in MP3 fomat:
• on Windows, you can listen with Windows Media Player or VLC Media Player
• on Mac you can use QuickTime or VLC Media Player.
If you need a MIDI player for your computer which lets you adjust tempo and volume, download MidiPlay (free) here
If you need free music notation software which lets you write your own scores (and also play MIDI and MusicXML files, adjust tempo, adjust volume), download MuseScore (free) here
There are several organisations producing rehearsal aids. For part-enhanced CDs visit ChoraLine or Cyberbass.
The John Fletcher Music website has part-enhanced MP3s - click on the links below or go to www.johnfletchermusic.org
Links to Musicroom.com are also below in case you would like to buy your own score.
Here's a Word document which has English translations of the commoner Latin sacred pieces - Te Deum, Missa sacra, etc. -