Indeed, you hear no sound any music, here, just like you don't see the wind. But you know it happens when you watch the movement of the dancers just as you see the grass moving to and fro due to wind. Please, take a look deeply, and now, you watch a show:
Scientific name: Miscanthus sinensis (Japanese Silver Grass )
Plant Profile:
See, http://www.hgtv.ca/outdoor/article/plant-profile-japanese-silver-grass-miscanthus-sinensis/
and also see, https://www.nps.gov/plants/alien/pubs/midatlantic/plants-to-watch.htm