(...some of my "slows to dance with a girl" list on my phone eheheh...)

spain "untitled #1" from "the blue moods of spain"
https://www.youtube.com/watch?v=QjYVUMz1Pgs
The Cinematic Orchestra - 'To Build A Home'
https://www.youtube.com/watch?v=oUFJJNQGwhk
Antony and The Johnsons - Hope There's Someone
https://www.youtube.com/watch?v=_ICWKLHBDIw
ornella vanoni - senza fine
https://www.youtube.com/watch?v=L21teozub6k
PAT METHENY and LYLE MAYS - IT'S FOR YOU
https://www.youtube.com/watch?v=805e8PJe8D4
The Velvet Underground - Ride Into The Sun
https://www.youtube.com/watch?v=SHdH3bAsgU8

I don't have a favorite, but the one that comes to mind the quickest. The live version of "Romeo and Juliet" by Dire Straits from this album, On The Night.

https://www.youtube.com/watch?v=64vvX6-d_JY