The blues

Blues
Blues guitarist and singer B.B. King in 2009
Stylistic origins	Work songs spirituals folk music
Cultural origins	Late 19th century, Southern United States
Typical instruments	Guitar piano harmonica bass drums blues harp slide guitar
Derivative forms	Bluegrass jazz jug band ragtime rock and roll country
Subgenres
Boogie-woogie classic female blues country blues electric blues jump blues piano blues (complete list)
Fusion genres
Blues rock gospel blues punk blues rhythm and blues soul blues
Regional scenes
British blues Canadian blues Chicago blues Delta blues Detroit blues hill country blues Kansas City blues Louisiana blues Memphis blues New Orleans blues Piedmont blues St. Louis blues Swamp blues Texas blues West Coast blues
Other topics
Blues genres blues musicians blues standards origins

Blues is a genre and musical form originated by African Americans in the Deep South of the United States around the end of the 19th century. The genre developed from roots in African musical traditions, African-American work songs, spirituals, and European-American folk music. Blues incorporated spirituals, work songs, field hollers, shouts, chants, and rhymed simple narrative ballads. The blues form, ubiquitous in jazz, rhythm and blues and rock and roll, is characterized by the call-and-response pattern, the blues scale and specific chord progressions, of which the twelve-bar blues is the most common. Blue notes (or "worried notes"), usually thirds or fifths flattened in pitch, are also an essential part of the sound. Blues shuffles or walking bass reinforce the trance-like rhythm and form a repetitive effect known as the groove.

Blues as a genre is also characterized by its lyrics, bass lines, and instrumentation. Early traditional blues verses consisted of a single line repeated four times. It was only in the first decades of the 20th century that the most common current structure became standard: the AAB pattern, consisting of a line sung over the four first bars, its repetition over the next four, and then a longer concluding line over the last bars. Early blues frequently took the form of a loose narrative, often relating the troubles experienced in African-American society.