Sigur Ros, Laeto, Mogwai, GSY!BE, Explosions in the Sky, Picastro, Pelican etc. all make popular music. Popular music is meant for dancing, that's why it is made with a rhythm section, and it shouldn't aspire to having the depth of classical music, because it can't. Just because you can dance to a band doesn't make them good, but they are at least fufilling the 1st function of pop. I don't know what reaction you are supposed to have to post-rock when you hear it. I'd say you don't know either, Ollie, and that's why you were nodding your head to the drums when Picastro played, to try and connect with it in some way