Can anyone give me recommendations for good high school choral pieces?

Question

I am taking a class at my college for choral literature, and I have to compile, by the end of the month, a personal single copy library of choral pieces for the high school level. Various difficulty levels would help since this is the start of my personal collection as a future choir teacher. If anyone has recommendations for essential high school choral music, please let me know titles and composers. If you know of any useful websites please let me know those too. Thank you!

Answer 1

One of my favourites in the school choir was Mozart's Ave Verum Corpus.