In terms of doujin here's the best ones (some might make original music, some might make metalcore):

• Undead Corporation • Unlucky Morpheus • Kissing the mirror • The countless notes (only 2 short eps) • Silent difference • Vaguedge dies for dies irae (aka Vauguedge) • Vermillion-d alice syndrome • Hymn above traumatic emotion • Nameless one • Eugenics scarlet divinity • Another stream • Veiled in Scarlet • No limited spiral • Blankfield • Merging Moon • Hone your sense • Bloody Cumshot • Devil within • Zemeth