So there is a debate going on in another forum I'm on - people over there seem to think that Prog Metal is not all that big of a character in the Prog world. I think they have no idea what they're talking about, but I have no idea how to prove it with sales numbers - does anyone know how you'd look up such a thing? I mean, duh, of course Dream Theater is outselling most other Prog bands these days, but what about other bands in the Prog category? How would I find sales numbers?