I’ve seen a few videos recently of musical instruments that you don’t touch. Above is a TED talk of Pamelia Kurstin playing a Theremin.
And here’s a video of an air piano:
httpv://www.youtube.com/watch?v=9K10XB1ycT4

Instead of seeing urban animals like crows as vermin, Josh Klein proposes training them to work with us to improve our environment. He built a “crow vending machine” that rewards crows with food if they deposit a coin, trash, or whatever the vending machine is set up to accept. Imagine using crows to clean up [...]