Metal is currently waist deep in a really exciting transformative stage. Just look at all the former metalheads returning back to the genre with renewed excitement. Think about it — Mastadon, Jesu, Isis, Red Sparowes, Pelican, Converge etc. — all amazing bands twisting expectations about what metal is and should be. Personally, I like how these bands mesh a sort of mathy, indie melancholy with…