Animals as Leaders, Thessa, Pomegranate Tiger, Myth of I, and Fractalize are great ones.

Stoort Neer and Vildjharta both have some really good instrumental albums.

Gore., Monolord, '68, and The Damned Things are all a little less heavy than what you might be looking for, but they are all great and have mostly clean vocals.

Polyphia and Chon are also both incredible but probably fall a little closer to something other than Metal.

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