Generally I have a parent volunteer teach music. However, she has been out for a couple weeks. She provided me with music lessons in her absence. In addition I have had my students play with an app called DoReMi 123 (thanks to the developers for providing me with a free copy). The app is geared toward younger children and/or students with less musical experience, more than 1/2 of my students take some type of instrument lesson. However, they had a fantastic time.
Their 2 favorite activities were playing a game similar to Simon where they had to copy a pattern of notes played by the app and creating their own tunes. I had them create tunes and share them with each other. In addition I asked them to relate each tune with a particular feeling and place.