Help with learning Rossini’s Petite Messe Solennelle

Alto rep Chris has very helpfully found some handy follow-the-music videos on YouTube to help with learning our music this term.
Have a listen and sing along!
The resources are by Chord Perfect.  However, enthusiastic learners will have discovered that they don’t cover the whole piece — in particular the tricky Cum Sancto Spiritus is missing.  But you can get an audio-only version of this from here.  (You can get all the parts by paying $4.99, which seems like a pretty good bargain.)