Adonis is a speed and thrash metal band from Los Angeles. Their sound nods to the classic speed metal revival while incorporating modern production sensibilities, drawing from LA's rich tradition of high-velocity metal.

Adora is a melodic death metal and metalcore band from Irvine, California that has been steadily building a body of work since their earliest demos in the mid-2010s. With two full-lengths — "...of Serpentine Forces" and "Ophidian Kult" — alongside EPs, demos, and a split, the band has refined a serpent-themed aesthetic married to tight melodic death metal riffing with metalcore intensity.

Adrienne is a metalcore band from Massachusetts. With a self-titled EP in 2021 and "Summer's Beginning" in 2023, the band plays emotionally charged metalcore that draws from the rich hardcore and metal traditions of the New England scene.

Casper, Wyoming metalcore project. The name's cautionary tone adds irony to aggressive music from the Cowboy State.

Aether is a melodic metalcore band from Salt Lake City, Utah. Active since 2013, the band has released two full-lengths — "One Chosen by the Gods" and "Tarot" — blending melodic guitar work with the heavy breakdowns and emotional intensity of modern metalcore.

Afflitus is a melodic death metal and metalcore band from the Bronx, New York City. Their 2005 EP "Promises You Can't Keep" packs ten tracks into a single release, blending the melodic guitar harmonies of Scandinavian death metal with the urgency of New York hardcore.

After the Sun is a metalcore band from Sioux Falls, South Dakota. Their 2019 EP "The Demise" brings heavy music to one of the least-represented states in the American metal underground.

Austin, Texas metalcore project. The name rebels against the old guard from a city that reinvents itself constantly.

Agents of Man is a New Jersey metalcore and hardcore punk band formed in 2000, featuring veterans of acts including Bulldoze, One4One, and Maximum Penalty. The band released Count Your Blessings in 2005 and maintained an active profile in the New Jersey and New York hardcore scenes before disbanding in 2006 and reuniting in 2018. Their sound sits at the intersection of metalcore and East Coast hardcore.