What song is playing throughout Issac and Mary's love scene?

There is a song that plays while Issac and Mary are dating (dancing in the apartment, on the boat in Central Park, etc) - after the line "Hit the lights." when they're in bed.

It's a piece with just bass, drums and piano - from the soundtrack albums it sounds like it could be 'Mine', but it's certainly not the same recording. Shazam searches bring up nothing.

Cheers!