If ya wanna test stereo speakers I suggest using Queens “ The Prophets Song” from the Night at the Opera album.
https://www.youtube.com/watch?v=iZjjsrn9FY4
The Prophets Song sounds like a simplified version of
another Queen song called “March of the Black Queen” on an earlier album. “March” is brimming to overflowing with music, piano wars, guitar riffs and overlays of harmonies.