As a music teacher I was excited to play some of the bard, here are some suggestions I have.
Can we make the notes on the xylo a pentatonic scale if there is 5? Basically the black keys on a piano. And if you match up the background music in the same key, no matter what notes you hit they will sound ‘right’ with the background music.
The dropping ball/ ‘rock band’ mechanic was disappointing. I think mage is fun because you have to learn/memorize the patterns. Why cant we have small songs/melodies that need to be played to charge up the balls? This would allow the bard to control what they charge, and as they get better it would make them more adept. Waiting for the balls is so slow, I think learning/playing melodies would be more fun.