This is my own terminology here, but the rad category is for the instro bands that thrive on adrenaline. Moreso than the other categories, a lot of these show punk and metal influences. It also rhymes with trad, and I like it more than "aggro".

Honorable Mentions

Noooo! Guys, you're too late to be included in the Best Album Art Gremmy! In any case, the cover art is a pretty good representation of the music inside: it's loud, fast and frantic, but also pretty silly, with some weird noises and instruments thrown into the mixture. The simple word for it is FUN. It's got serious force behind it but it doesn't wield it so seriously. Definitely worth a listen!