Hopefully we can get an entire jazz band out there. I see a lot of people animating the piano with the typing animation, so that could use a few styles, like Chopsticks, intense focus, singing while playing, etc.
Other instruments I would recommend:
Saxophone
Violin
Bass
Trumpet
Trombone
Flute
Clarinet
Didgeridoo
Tuba
Triangle
And, most important of all:
Cowbell