[Monsieur D'Arque]

What is the song? I heard it on a commercial once years ago, and I can't find it anywhere else but Whose Line.

http://www.youtube.com/watch?v=hJ1oDYSfKj8

[UniquePerspective]

I've never seen Whose Linemusic be used elsewhere, it seems to be pre-composed music similar to what fits the scene. Although the exception may be Improbable Mission.