This comes to mind as a slow, relaxing song. Not exactly "Aqueous," but still very good and chill.
Death Cab - Passenger Seat (YouTube)
Coming Home, the last track on Volumizer by 2 skinnee J's.
You can always listen to Massive Attack! ;)
the Remix version of 'Peer Pressure' by Jon Brion, (in its own 'moving away into the distance') does it for me:
but one that's closest to the dot... in my opinion,
'Alone in Kyoto' by Air, off of the Original Soundtrack for Lost in Translation :)