Not sure I'd consider Polvo math rock, though I don't know what you'd call them. They kinda fit in with that Thinking Fellers / Truman's Water weird complex noise rock genre that has no description but is just ridiculously amazing. And Chavez are pretty good but not math rock. And I've never actually heard slint called math rock, I think they are supposedly the originators of what we now call "post-rock".
I don't really care about any of that, just saying.
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