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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.

Blues rock is a guitar-driven style that fuses the raw feeling and 12‑bar structures of the blues with the power, volume, and rhythmic punch of rock. It emphasizes riff-based songs, pentatonic and blues-scale soloing, call‑and‑response between voice and guitar, and an expressive, often gritty vocal delivery. Typical ensembles are power trios (guitar, bass, drums) or quartet formats adding second guitar, keyboards, or harmonica, and performances commonly feature extended improvisation. Sonically, it favors overdriven tube-amp tones, sustained bends, vibrato, and dynamic contrasts, moving from shuffles and boogies to straight‑eighth rock grooves.

Electric blues is a postwar evolution of the blues that centers on amplified instruments and a compact, urban band sound. It emerged when rural blues musicians brought their music to industrial cities and adopted electric guitar, amplified harmonica, bass, drums, and piano to cut through noisy clubs. Musically, electric blues relies on 12‑bar and 8‑bar forms, dominant‑7th harmony, and a swung shuffle or boogie groove. Guitarists use string bends, wide vibrato, double‑stops, turnarounds, and call‑and‑response with vocals and harmonica. Amplified harmonica (often through a bullet mic and small tube amp) acts like a lead horn, trading riffs with the guitar. The sound is thick, gritty, and vocal, with tube‑amp breakup, subtle reverb, and sometimes tremolo. Lyrically, themes cover migration, love and betrayal, work and hardship, and the pulse of city life. Regionally, Chicago became the emblem of the style, but strong variants also blossomed in Memphis, Detroit, and Texas.

Modern blues is a contemporary evolution of traditional and electric blues that embraces current songwriting, studio techniques, and cross-genre collaboration. It preserves the core blues vocabulary—blue notes, call-and-response phrasing, and 12‑bar and minor‑blues forms—while integrating elements of rock, soul, funk, and even pop and hip hop production. Sonically, modern blues favors saturated but articulate electric guitar tones, prominent backbeat drums, thick bass, and tasteful keys or organ. Lyrically it updates classic themes of struggle, love, resilience, and place with present-day imagery and personal storytelling. The result is a style that feels rooted and authentic yet radio- and festival-ready.

New Orleans blues is a piano- and horn-driven branch of postwar blues that developed in the clubs and studios of New Orleans. It blends the city’s brass-band and parade traditions with the relaxed swing of jazz, the rolling left-hand figures of boogie-woogie, and the clipped, syncopated “second‑line” feel rooted in Afro-Caribbean rhythms. Characterized by lilting triplet feels, tresillo/habanera accents, and a light yet insistent backbeat, the style favors catchy horn riffs, rolling piano patterns, and conversational, good-natured vocals. Compared with harsher urban blues styles, New Orleans blues feels breezier and more danceable, often straddling an early rhythm-and-blues sound that directly fed rock and roll.