You might dust off "Kumbaya," which has the value of repetition, a great tune, and introducing one verb at a time. It was a song I used for a Christmas holiday concert at my high school in Ethiopia back in the early 1960's; I taught it to a group of South African refugee students who taught me how the song could be sung in chords. No telling what you can learn from your students!

Cheerily,
Charley Noble