For windy

[The Beatles]

This might be a bit late, but anyways I've found two tracks that do what you want with that circuit. Both by Hendrix. One's the classic Purple Haze, in which his voice is really faint (although still audible) on one side, but strong on the other. The other's Foxy, in which his voice is mostly inaudible (only sometimes can you hear it), although on the other side compared to Purple Haze. The choruses (Purple Haze, Foxy Lady) come through fine on each side -- although a bit more eerily.

[The Beatles]

You might want to delete this post after getting the file, as technically it's copyright infringement.

[The Beatles]

And this one...

[windhound]

thankee beatles!

presentations are in.. two weeks.. going to build the full thing somtime this week, need to get the other mess off my breadboard..