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Doo-wop is a vocal harmony–driven style of rhythm and blues that blossomed in mid-century urban America. Built around lead-tenor melodies, lush background harmonies, and playful nonsense syllables (the source of its name), the genre blends church-bred gospel techniques with street-corner spontaneity. Musically, doo-wop favors simple, singable chord cycles—especially the “’50s progression” (I–vi–IV–V)—a steady 4/4 or lilting 12/8 feel, and call-and-response between lead and backing parts. Arrangements range from a cappella to small combos with guitar, piano, bass, light drums, and occasional saxophone. Lyrically, the songs are often teen-centered: romance, longing, heartbreak, and devotion. The sound emerged in the late 1940s within African-American communities and soon resonated across ethnic lines, inspiring groups in cities such as New York, Philadelphia, Chicago, Detroit, and Los Angeles. Its polished harmonies, sweet ballads, and hooky refrains helped shape early rock and roll and later pop harmony traditions.

Blues is an African American musical tradition defined by expressive "blue notes," call-and-response phrasing, and a characteristic use of dominant-seventh harmony in cyclical song forms (most famously the 12‑bar blues). It is as much a feeling as a form, conveying sorrow, resilience, humor, and hard-won joy. Musically, blues commonly employs the I–IV–V progression, swung or shuffled rhythms, and the AAB lyric stanza. Melodies lean on the minor/major third ambiguity and the flattened fifth and seventh degrees. Core instruments include voice, guitar (acoustic or electric), harmonica, piano, bass, and drums, with slide guitar, bends, and vocal melismas as signature techniques. Over time the blues has diversified into regional and stylistic currents—Delta and Piedmont country blues, urban Chicago and Texas blues, West Coast jump and boogie-woogie—while profoundly shaping jazz, rhythm & blues, rock and roll, soul, funk, and much of modern popular music.