Spectral Spectrum is a Massachusetts black/heavy metal band formed in 2023, blending the raw, cold edge of black metal with melodic heavy metal songwriting. The project reflects a broader trend in the American underground of pairing traditional metal's hook-driven structures with black metal's atmospheric harshness.

Speedfreak is a Southern/heavy metal band from Chicago, Illinois, formed in 2022, blending the groove and swagger of Southern metal with classic heavy metal riffing in an unusually Northern context.

Speer is a thrash/heavy metal band from Casper, Wyoming, formed in 2014, one of very few metal acts emerging from Wyoming's isolated high plains, playing straightforward metal rooted in classic thrash and traditional heavy metal.

Spell Breaker is a traditional heavy metal band from El Paso, Texas, formed in 2025, playing classic-styled metal drawing on the NWOBHM and American heavy metal traditions from one of Texas's border cities.

SpellBook is a heavy metal and hard rock band from York, Pennsylvania, formed in 2020, playing classic-influenced heavy metal with a foundation in hard rock dynamics and traditional song structures.

Spellcaster is a heavy/speed metal band from Portland, Oregon, formed in 2014, reviving the NWOBHM-influenced speed metal sound of the early 1980s with strong melodies, galloping riffs, and a classic aesthetic.

Spellgrinder is a heavy metal band from Twentynine Palms, California, formed in 2023, playing traditional heavy metal from the high desert of the Mojave with a sound rooted in classic metal song craft.

Spherical Obscenity is a Buffalo, New York band formed in 2017 that combines melodic death metal's harmonic sensibility with traditional heavy metal structure, balancing hook-driven riffing against heavier rhythmic attack.

Spike is a Cincinnati heavy metal band that has been active since 2016, playing straightforward, riff-driven metal with roots in classic American and NWOBHM-influenced traditions.