Wind chimes are one nature-powered music device, but here is another: a solar thermal organ.
httpv://www.youtube.com/watch?v=Vv0ulNLRkWM [video link]
Parabolic reflectors power thermoacoustic variable-pitch pipe resonators. In another video the creator describes how the sun can cast shadows on arrays of thermal organs, changing sound as the sun moves.
[kudos Make:]