When I’m learning a choral piece, I really need to learn the notes of my part before I can start to understand its relationship with the others. (And that is why I am not a musical director. That, and my temperament, and my shaky sense of pitch, and…) So I am a great fan of choral learning files.
My go-to site used to be Cyberbass. Here is the Cyberbass page for the Puccini Mass:
I can’t find the Fauré Cantique on Cyberbass.
Cyberbass uses a file format called MIDI, but these days the files cannot be downloaded, instead they are played from the web page via a browser plug-in. This works well enough with most browsers on most PCs; I don’t know about mobile devices. There’s a separate file for each choral part, plus one that combines all four. There doesn’t seem to be any accompaniment, still you should be able to follow the music with the aid of a score.
The site I have tended to use recently is Choralia. This site uses a technology called Virtual Singer (VS), as the choral parts are “sung” by synthesised voices. This sounds quite weird at first, but is surprisingly helpful (but don’t take it as a guide to vocal nuance or expression). Choralia offers the VS files themselves, but it’s much easier to deal with the MP3 audio files. Here are links to the Puccini Mass and the Fauré Cantique:
I prefer the “Voice with Metronome, Organ” option. You can (probably) play these by clicking on them in your browser, otherwise you can download them (yes, this is a bit tedious for the 12 movements of the Mass) and play them on any media player. I like to listen to them on my MP3 player at the gym.