A nice idea,
To begin with, I didn't really like the way you had the motion and size fitting the tune since it seemed a bit forced.
I liked it when the light 'sang' to the street lamp though and I'd have liked to have seen the idea extended further, with more lights 'singing'.
The cigar bit seemed too short, and the last scene with the 3 lights looked as if you'd gotten bored or something by that point.
I did really like the reflection on the water though.
All in all, an enjoyable watch, although I can't help feeling you could have maybe made a little more of the idea.
I'm not suggesting you make it longer, but I would have just liked to see more lights singing to each other... if the cigar had started 'singing' like the street-lamp and the lady had thrown her arms up in shock, that could have been mildly amusing...
As I said, it's an enjoyable watch as it stands.