Years ago, my department set out to teach our students various songs. All classes met in a bigger room and we would work on a few songs, watch some videos, and hand out awards to exemplary students!
This file has continues to be modified throughout the years; in fact, there are so many that we don't always teach every song, or some get deleted/added.
I always teach a capella style, but if you don't know the words, there are plenty of videos online to help you sing the tune. Enjoy!