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AOR (often read as Album-Oriented Rock and, in stylistic terms, Adult-Oriented Rock) is a polished, melody-forward strain of rock geared for FM radio and arena stages. It pairs sleek production with anthemic choruses, soaring vocals, and a balance of guitar crunch and prominent keyboards, aiming for broad appeal without sacrificing musicianship. In practice, AOR sits between hard rock and soft rock: tight rhythm sections, glossy multi-tracked harmonies, clean-to-overdriven guitar leads, and radio-friendly structures. Its repertoire spans driving uptempo anthems and emotive power ballads, with frequent key changes for climactic final choruses, meticulously layered arrangements, and lyrical themes of romance, resilience, and escape.

Glam rock is a style of rock music that emerged in the early 1970s, defined as much by its flamboyant image and theatricality as by its sound. Artists embraced androgynous fashion, glitter, makeup, platform boots, and bold stage personas, using spectacle to amplify simple, catchy, riff-driven songs. Musically, glam rock fuses the drive of 1950s rock and roll with hard rock crunch, bubblegum pop hooks, and a sense of artful provocation. Songs often feature stomping, chant-ready rhythms, big choruses, guitar riffs, handclaps, and shout-along refrains. Lyrically, it leans into themes of fantasy, fame, gender play, street romance, and campy drama, blurring the line between pop accessibility and avant-garde performance.

Power pop is a guitar-driven style that distills the melodic immediacy of 1960s British Invasion pop into concise, high-energy rock songs. It emphasizes big hooks, ringing guitars (often Rickenbacker-style jangle), tight vocal harmonies, and punchy, economical arrangements that typically run around three minutes. Lyrically, it leans toward youthful longing, romance, and bittersweet nostalgia, delivered with bright major-key progressions, chiming arpeggios, and sing-along choruses. Though Pete Townshend used the term in the late 1960s, the genre cohered in the early 1970s with bands like Badfinger, Big Star, and the Raspberries, and it has resurfaced repeatedly in waves through new wave, indie, and modern pop-punk contexts.

Classic rock is a radio-defined umbrella for mainstream, guitar-centered rock music from the mid-1960s through the 1980s. It emphasizes blues-based riffs, memorable choruses, sturdy backbeats, and prominent guitar solos, often framed by warm, analog production. Rather than being a single stylistic branch, classic rock curates a canon that spans hard rock, blues rock, folk rock, psychedelic and progressive strains, and heartland- and country-tinged rock. Albums and album-oriented rock (AOR) values—extended tracks, conceptual cohesion, and musicianship—are central to its identity. The sound evokes tube-amp crunch, Hammond organs, stacked vocal harmonies, and anthemic songwriting designed for both FM radio and the concert arena.

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.

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.