This quarantune (a song written during the Covid-19 quarantine) is in the Freygish mode (also known as Phrygian dominant.) I actually originally wrote it in Locrian, but it didn't quite set right.
This song has built in opportunities for echoing, as well as improvisation.
Fifty Tunes for Teaching
Check out this book which contains 50 new songs with and without words for use in the general music class. Sequenced according to Gordon's Music Learning Theory.