This is a great addition, Erik! I also explored with having students improvise on barred instruments using tremelo as a transition between players. Using a limited tone-set, say, E G A B, I asked the students to improvise in an unmetered fashion and when they were feeling “finished” to play a tremelo on any of these notes that they chose. Their partner then begins their improvisation by joining the tremelo and when the original partner releases the tremelo, the new player and begin theirs. It is an activity that lives outside of the game and is a beautiful “next step.” Thank you for the reminder about how important improvisation is for the students, our goals should always be striving toward inspiring student creativity!