Im SO fucking glad this is already a thing. Theres a few bands mis tagged though, dep is mathcore, as the sun sets is more grind to me than mathgrind, daughters is noisecore (which is basically the same thing but Im jus saying), iwabo isn't math, and neither is gaza.
Ed Gein, Lilu Dallas, the original ABACABB line-up (pre-brotard moshcore bullshit), Me and Him Call It Us, there was even a few songs off of the first Norma Jean album and Heavy Heavy Low Low's earlier stuff that I always figured was called "mathgrind". If thats what this is (or rather, was supposed to be), then this "genre" fucking rules. 187 Records in 2006 was the fucking best label ever, son.