Hmm, nice. But, yep, it's a tough one. I like math, but not that much, for me it's a bit too narrow. Prog is better, but first thing that comes to mind is 'alternative', although this is a reeeally vague term. But that means it's definitely not metal. It might be prog, it might be electronic. But yeah, what does alternative mean? Where do you draw the line? Is my soft bedtime crooning alternative in the sense matt sokol is? I would say so. But are queens of the stone age alternative? Yep. Red Hot Chili Peppers? Naaaah... Don't know man. It's really tough to come up with a criterion here. Mine is usually a form of sincerity - is it sincere in the way I understand the term? But this also doesn't mean anything.