Subway Ride (Instrumental) by Marcelo Zarvos is pretty boring to be listened again and again. Yes, there is the piano, a lonely violin flows somewhere, but the general feeling from it is rather a depressing. It is more like the individual instrumental sounds, than a solid sounding, so it wouldn’t be considered as a melody, actually. Neither mood, nor what creators wanted to say, is unclear.
Reference: Marcelo Zarvos - 'Subway Ride' - Listen on Deezer