Incredibly moving
The first thing I noticed about this song the first time I listened to it was the background music flowed perfectly with the piano's ups and downs.
I'm not a musician, so I don't know the proper terms, but when the piano went from low to high keys, the background swayed with it, and as it went lower, the rest of the song did too.
The pieces really moved well together.
At first I thought it might have been a sad song, but the more I listened to it, the happier I felt. It's very calm and relaxing...makes me think of sitting on the beach watching the waves roll in with the sun setting on the horizon.