Beautiful and a work of art. 

Reddit comments:

https://reddit.com/r/videos/comments/48klsm/musical_marble_machine_mind_blown_man_builds_real/

I lost it when he pulled the breakdown lever.  This is so beautiful. 

I know, right? So delightful!

wow!!!!

i can't believe a marble machine can make such complete sound!!!

so complicated!!!

And yet the mechanism is so simple. 

Here's another Wintergatan music box featuring a paper pulling mechanism. 

Stands up to repeat viewings.