Enjoy the options:
https://www.youtube.com/watch?v=Kmft674XPC0 - Ava Maria
https://www.youtube.com/watch?v=qxUxwiXYUkE - Amazing Grace
https://www.youtube.com/watch?v=7E_U1xyK7Gw - Saw Duet (same guy) Classical jazz song - can't remember the name of the song
https://www.youtube.com/watch?v=Hm1vUU52JAE - Over the Rainbow
https://www.youtube.com/watch?v=cHP9YBNK5AU - Beethoven, Moonlight Sonata