Down to the Bone

Album rock (often associated with the album‑oriented rock, or AOR, FM radio format) refers to rock music created and programmed with the album as the primary artistic unit rather than individual hit singles. Emerging on U.S. FM radio in the early 1970s, it spotlighted deeper album cuts, long-form tracks, and cohesive sequencing, drawing heavily from progressive, psychedelic, art, hard, blues, and folk rock. Musically, album rock favors full-band arrangements, extended solos, dynamic contrasts, and high-fidelity production intended for immersive, start-to-finish listening. While overlapping with “arena rock” and later “classic rock,” album rock is best understood as an album-centered approach and a radio culture that shaped how rock acts wrote, produced, and presented their music.

Heavy metal is a loud, guitar-driven style of rock defined by heavily distorted riffs, thunderous drums, and powerful vocals. Its musical language emphasizes minor modes, modal (Aeolian, Phrygian) riffing, and energy over groove, often featuring virtuosic guitar solos and dramatic dynamic contrasts. Emerging from late-1960s blues rock and psychedelic experimentation, heavy metal codified a darker, heavier sound with bands like Black Sabbath, Deep Purple, and Led Zeppelin. The genre values weight, intensity, and grandeur—whether through plodding, doom-laden tempos or galloping, high-energy rhythms—paired with themes that range from personal struggle and social critique to fantasy, mythology, and the occult.

Hard rock is a loud, riff-driven style of rock music built around heavily amplified electric guitars, a powerful rhythm section, and assertive vocals. Songs typically center on memorable, blues-based guitar riffs, strong backbeats, and energetic, often shouted or belted choruses. The genre emphasizes power, groove, and visceral impact over intricate harmony or extended improvisation. Distortion, power chords, pentatonic melodies, and call‑and‑response between vocals and guitar are core traits, while lyrical themes often explore rebellion, lust, swagger, escape, and cathartic release.