Orange County's Atreyu helped shape the metalcore landscape of the early 2000s with their dual-vocal attack and melodic sensibility on albums like 'The Curse' and 'A Death-Grip on Yesterday.' Named after the hero of The Neverending Story, the band's anthemic choruses and Alex Varkatzas's fierce screams made them staples of the Ozzfest and Taste of Chaos touring circuit.

Avenged Sevenfold formed in Huntington Beach in 1999 and became one of the most successful American metal bands of the 21st century by refusing to stay in one lane. Sounding the Seventh Trumpet and Waking the Fallen placed the band in metalcore, with screamed vocals, fast riffs, and dramatic song structures. City of Evil transformed them into a twin-guitar heavy-metal force, while Avenged Sevenfold, Nightmare, and Hail to the King pushed arena hooks, hard rock, and classic-metal influence to the front. The Stage and Life Is But a Dream... later expanded the band's progressive and experimental side, proving that their ambitions reached beyond radio metal. Avenged Sevenfold fit metal scope directly through their riffs, solos, breakdown origins, and major role in the New Wave of American Heavy Metal. Their catalog is held together by M. Shadows' theatrical vocals, Synyster Gates and Zacky Vengeance's guitar chemistry, and a taste for excess that can be melodic, technical, macabre, or absurd. At their best, A7X make modern metal feel grand, restless, and defiantly personal.