When I was a hippie we used to conduct speaker tests with an empty beer bottle and a copy of Live at Leeds or Who's Next. If, during a Pete Townshend power chord, the speakers could make the bottle buzz and vibrate around on our coffee table, then they were worthy speakers. I seem to recall that Bose 901's were worthy speakers...
Then you get a song like "Why Worry" that is so beautiful it almost makes you cry.