Sleep

Retro metal is a 2000s-era revival of the riff-first, analog-warm heavy sounds associated with 1970s/early‑1980s hard rock and classic metal. Its bands deliberately echo the era’s fuzzy guitar tones, blues-rooted riffs, occult/psychedelic aesthetics, and live-in-the-room production choices. Critics used the label for groups that drew heavily from Black Sabbath, Pentagram, Deep Purple, and the NWOBHM palette, often blurring lines with stoner/doom and psychedelic rock. The result is mid‑tempo grooves, stacked twin‑guitar harmonies, vintage keyboards or organs, and vocals that range from soulful grit to nasally occult croon.

Heavy psych is a louder, denser offshoot of late‑1960s psychedelic rock characterized by fuzz‑soaked guitar tones, wah‑drenched solos, thunderous drums, and a visceral low‑end. It takes the exploratory jams and mind‑bending studio tricks of psychedelia and pushes them toward proto‑metal weight and volume. Musically, it leans on blues‑based riffs, pentatonic and modal improvisation (especially Dorian and Mixolydian), droning vamps, and feedback‑saturated climaxes. Production often favors analog saturation, tape echo, phasing, and other period effects that magnify a sense of heady, cosmic intensity. The result is a sound that bridges psychedelic freedom and hard rock punch—music that feels both trippy and physically overwhelming, laying essential groundwork for heavy metal, stoner rock/metal, doom, and space rock.