Does anyone have any (or know of any) tracks I can use to test the soundstage of different headphones?

Thanks!

But each ear hears only one loudspeaker - there cant be any soundstage unless you use something like DolbyHeadphone...

Is there even anything to test with headphones?

I would recommend the albums Dire Straits - Brothers in Arms, and Pink Floyd - The Final Cut as excellent material to test headphones on.

In particular tracks, Ride Across the River and Paranoid Eyes, although there are several tracks on each of the albums.

Try to find some binaural recordings.

Peter Gabriel albums should be a good candidate