Ok, some of my favorites:
Gerudo Valley (Smash Bros for Wii U remix).
https://www.youtube.com/watch?v=RmOb0mQMpK8
Comet Observatory (Super Mario Galaxy).
https://www.youtube.com/watch?v=8iqMMGNixvk
Esther (Dear Esther).
https://www.youtube.com/watch?v=nB5_nCyt1L8
Overworld theme (Zelda: Spirit Tracks).
https://www.youtube.com/watch?v=7mnPPOgf000
I could go on and on, but these are pretty diverse. I had a colleague that thought of playing the first song on her wedding, even though she didn't play games.