4 (Expanded)

Glam metal (often called hair metal) is a flamboyant strain of 1980s hard rock and heavy metal defined by high-energy riffs, anthemic choruses, and glossy, radio-ready production. It pairs the swagger of hard rock with pop hooks, multi-tracked vocal harmonies, and virtuosic guitar solos. Visually, the style is theatrical: teased hair, makeup, spandex, and flashy stagewear echo the glam rock of the 1970s, while the music embraces both party-ready anthems and power ballads. The sound is big, bright, and built for arenas and MTV-era music television.

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.

Pop is a broad, hook-driven style of popular music designed for wide appeal. It emphasizes memorable melodies, concise song structures, polished vocals, and production intended for radio, charts, and mass media. While pop continually absorbs elements from other styles, its core remains singable choruses, accessible harmonies, and rhythmic clarity. Typical forms include verse–pre-chorus–chorus, frequent use of bridges and middle-eights, and ear-catching intros and outros. Pop is not defined by a single instrumentation. It flexibly incorporates acoustic and electric instruments, drum machines, synthesizers, and increasingly digital production techniques, always in service of the song and the hook.

Rock is a broad family of popular music centered on amplified instruments, a strong backbeat, and song forms that foreground riffs, choruses, and anthemic hooks. Emerging from mid‑20th‑century American styles like rhythm & blues, country, and gospel-inflected rock and roll, rock quickly expanded in scope—absorbing folk, blues, and psychedelic ideas—while shaping global youth culture. Core sonic markers include electric guitar (often overdriven), electric bass, drum kit emphasizing beats 2 and 4, and emotive lead vocals. Rock songs commonly use verse–chorus structures, blues-derived harmony, and memorable melodic motifs, ranging from intimate ballads to high‑energy, stadium‑sized performances.