Blues
Three chords, twelve bars, and a bad day: the recipe that ended up underneath almost everything you hear on the radio.
By Greg Goodwin · Published October 17, 2026 · Updated October 24, 2026
Cheat Sheet
- Form: the classic twelve-bar blues cycles through three chords, the I, IV, and V, usually played as dominant sevenths (in C: C7, F7, G7).
- Blue notes: slightly lowered thirds, fifths, and sevenths in the melody, often bent between the notes of a piano.
- Crazy Blues: recorded in August 1920 by Mamie Smith and Her Jazz Hounds on Okeh; it sold 10,000 copies in its first week and 75,000 within a month.
- Robert Johnson: recorded 29 songs in two sessions (San Antonio, November 1936; Dallas, June 1937) and died on August 16, 1938.
- Published firsts: 'Dallas Blues' and W.C. Handy's 'Memphis Blues' were both published in 1912; which counts as the first published blues is debated.
- Great Migration: by one common account Muddy Waters left Clarksdale, Mississippi for Chicago in 1943 and later recorded for the Chess label.
The 60-Second Version
The blues is a genre of African American folk music created in the American South before the turn of the 20th century. It pairs plainspoken lyrics about hardship, love, and stubborn humor with a voice that trades phrases with a guitar or other instrument, and its melodies bend toward blue notes that sit slightly flat of the major scale. The best-known skeleton is a twelve-bar pattern that repeats through the song. For years the blues spread through traveling musicians and sheet music, but in 1920 Mamie Smith's hit record proved there was a paying audience, and record companies began marketing music to Black listeners. As Black Southerners moved north during the Great Migration, the music got louder and electric, giving rise to Chicago blues. By the 1960s, the blues had become one of the most important influences on popular music, feeding into jazz, rhythm and blues, and rock and roll.
The Long Version
Roots in the South
Britannica describes the blues as a folk music created by African Americans before the turn of the 20th century, originally in the South. Because it was passed along by ear and recording came later, there is no single starting date. The Mississippi Delta became its best-known early cradle. Players such as Charley Patton, Willie Brown, and Son House played parties and fish fries there, and a young Robert Johnson, born in Hazlehurst, Mississippi in 1911, tagged along with them before developing a style of his own.
How It Works
A blues song usually follows a twelve-bar cycle. In its simplest form it uses only three chords, built on the first, fourth, and fifth notes of the scale, usually as dominant sevenths. A typical verse states a line, repeats it, and answers it with a third line, so the singer sets a problem, doubles down, and then gets the punchline. Blue notes, slightly lowered thirds, fifths, and sevenths, give the melody its aching quality, and because they fall between the keys of a piano, they are natural for voices, slide guitars, and harmonicas. The guitar often answers the singer's phrases, a call-and-response habit that gives many blues songs their conversational feel.
From Sheet Music to Records
The blues entered popular culture in the early 1910s. Hart Wand's "Dallas Blues" and W.C. Handy's "Memphis Blues" were both published in 1912, and historians still argue about which deserves the label of first published blues, and whether Handy's piece was structurally a blues at all. The real turning point came in 1920. Okeh Records had planned a session with the white singer Sophie Tucker, who fell ill, so songwriter Perry Bradford persuaded the label to use Mamie Smith instead. Her "Crazy Blues" sold 10,000 copies in its first week and 75,000 within a month, and it opened a market for what the industry called race records. Smith was more a vaudeville entertainer than a classic blues singer, but Ma Rainey, Bessie Smith, and Blind Lemon Jefferson soon followed her into the studio.
Robert Johnson and the Crossroads
Robert Johnson's legend is larger than his catalog. He recorded 29 songs in two sessions, in San Antonio in November 1936 and in Dallas in June 1937, then died in Mississippi on August 16, 1938, reportedly poisoned. The National Park Service notes that some people believed Johnson had met the devil at the crossroads and traded his soul for his guitar skill, and it adds that his playing mixed shuffling rhythms with slide guitar leads. The legend is just that: the NPS account says he returned from a stretch away with dazzling technique after practicing and learning songs from phonograph records.
Going North and Plugging In
Between the 1910s and 1970, millions of Black Americans left the rural South for northern cities in the Great Migration. The music traveled with them. In Chicago, players like Muddy Waters, who reached the city in 1943 by one common account, turned to amplified guitars, and labels like Chess Records recorded Waters and Howlin' Wolf in a harder, band-driven sound. That electric style carried the blues into the postwar mainstream. Britannica has a section subtitled "the mother of all music," a phrase that captures how much of popular music, from jazz to soul to rock, grew from this one branch.
Why People Care
The blues is a root system for American popular music, and knowing its basic form, a twelve-bar pattern with blue notes, lets you hear it inside jazz, rock, soul, and country. It is also a document of Black history, carrying the experience of the South and the Great Migration into song.
Glossary
- Blue note
- A pitch sung or played slightly flat of the major scale, giving the music its bittersweet tone.
- Twelve-bar blues
- The standard blues structure: a twelve-measure chord pattern repeated through a song, with lyrics often in an AAB pattern.
- Delta blues
- An early, guitar-driven style from the Mississippi Delta region, associated with players like Charley Patton and Son House.
- Chicago blues
- An electrified, band-driven style that grew from Delta blues after Black Southerners migrated north.
- Race records
- A label used from the 1920s to the 1940s for records aimed at African American buyers.
Go Deeper
More to Explore
- Electronic Dance Music (EDM)
Before "EDM" became a festival-sized brand, Black and queer DJs were building its sound in underground clubs.
- Country Music
Country's "outlaw" rebels weren't rejecting the genre, just Nashville's polished, studio-controlled way of making it.
- Reggae
Reggae's signature move is stressing the offbeat, the very beat most other popular music glosses over.
- Punk
A genre whose entire founding philosophy was that you didn't need to be good at your instrument to start a band — you just needed something to say.
- Hip-Hop
A genre born from DJs looping the same ten seconds of a record over and over — now the single most-streamed music genre in America.