Plant music.
Different plants/trees play different notes.
It's fascinating.
That lady has many different tracks she's recorded of different plants/trees. They all have their own unique sound. It's pretty cool.
I think she has a few more videos on her youtube channel.
https://www.youtube.com/channel/UCW0AAFY5q-lQYKzYfNilmSQ
Also, she has some research that she commissioned that shows it has an effect on the human body.