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Adult contemporary (AC) is a radio-driven pop style characterized by smooth vocals, polished production, and lyric themes that speak to adult listeners—love, family, reflection, and everyday life. Musically, it emphasizes mid‑tempo grooves and ballads, clear melodies, and accessible harmonies, often arranged for piano, acoustic or clean electric guitars, light drums, bass, and tasteful string or synth pads. The sound favors warmth and clarity over aggression, with a strong focus on memorable choruses and emotive vocal performances. As a format and a repertoire, adult contemporary bridges soft rock, pop balladry, and easy listening, adapting with each decade while maintaining radio-friendly songwriting and production values.

Soft rock is a mellow, melody-forward strain of rock and pop that favors smooth vocals, polished production, and restrained dynamics over distortion and aggression. Built on acoustic and clean electric guitars, piano or electric piano (Rhodes), light rhythm sections, and lush backing vocals or strings, the style centers on memorable hooks and sentimental themes. Its lyrics often explore love, heartbreak, nostalgia, and introspection, delivered with warmth and clarity. Tempos are moderate, grooves are unobtrusive, and harmonies are diatonic with tasteful color (maj7, add9) and occasional key changes. Commercially, soft rock flourished on AM radio and adult contemporary playlists in the 1970s and early 1980s, shaping the sound of radio-friendly ballads and influencing later styles like yacht rock and modern adult contemporary.