This was a promotional stunt in a Belgium train station for the show "How Do You Solve a Problem like Maria?" where they are trying to find the new lead for the musical "The Sound of Music".
What I like about it is that almost everyone who happens upon the scene ends up singing and dancing along.
I mean, how could you not to that song!?
In these sad economic times, maybe one way to solve some of these problems...
Is with Maria.