Philadelphia brutal death metal act Trephination have been operating since 2019, bringing the city's storied extreme metal heritage into the realm of blast-beat intensity and guttural excess. Their Bandcamp presence reflects a band focused on craft rather than visibility, letting the music do the talking.

Troglodyte is a Philadelphia death metal band formed in 2011, delivering heavy, no-frills death metal rooted in the mid-Atlantic underground scene.

Trollkicker is a raw black metal project from Pittsburgh, Pennsylvania, formed in 2013, operating in the lo-fi, abrasive end of the genre with an emphasis on primitive intensity over production polish.

Troughman is a Pittsburgh death metal and grindcore band formed in 2021, combining the brutality of death metal with the velocity and brevity of grindcore.

Sludge metal band from Lansdale, Pennsylvania, formed in 2014, built on slow, crushing riffs and the corrosive sonic weight characteristic of the genre.

Pennsylvania death/thrash metal band formed in 2020, channeling the punishing crossover of extreme thrash aggression and death metal brutality that defined late-1980s underground metal.

Turncloak is a folk and Viking metal band from Palmerton, Pennsylvania, formed in 2014, incorporating folk instrumentation and Norse-inspired themes into a foundation of traditional heavy metal.

Twenty Thousand Fathoms is a progressive metalcore band from Erie, Pennsylvania, formed in 2020, drawing its name from Jules Verne's ocean depths and crafting expansive, technically adventurous music that pushes the boundaries of metalcore.

Tyrant is a death metal band from Pittsburgh, Pennsylvania, formed in 2018, delivering straightforward brutality in the tradition of the American death metal underground.