Blues is a musical form and genre that originated in African-American communities in the "Deep South" of the United States around the end of the 19th century from spirituals, work songs, field hollers, shouts and chants, and rhymed simple narrative ballads. The blues form, ubiquitous in jazz, rhythm and blues and rock and roll, is characterized by specific chord progressions, of which the twelve-bar blues is the most common. The blue notes that, for expressive purposes are sung or played flattened or gradually bent in relation to the pitch of the major scale, are also an important part of the sound.
Blues as a genre is based on the blues form but possesses other characteristics such as lyrics, bass lines, and instruments. Blues sub-genres include country blues, such as Delta, Piedmont and Texas blues, and urban blues styles such as Chicago and West Coast blues.
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