Greetings, I personally run Klipsch laScalas and find their rendering of ROCK to be outstanding. Their super high sensitivity and ability to play extremely loud are just a couple of their superior attributes.
That said, I really don't agree with your initial premise. I believe the following to be true:
1. That a truely outstanding full spectrum set-up will sound excellent with all kinds of music.
2. That certain types of music are more able to bring out the weaknesses and strength of any given system.
So, I guess what I'm trying to say, is that the issue shouldn't be what type of music sounds the best with certain components, but rather, what are the actual strengths and weaknesses of those components.
Happy listening...