blues music

Blues is the name given to both a musical form and a music genre that originated in African-American communities of primarily the Deep South of the United States at 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—the twelve-bar blues chord progressions being the most common—and the blue notes, notes that for expressive purposes are sung or played flattened or gradually bent (minor 3rd to major 3rd) in relation to the pitch of the major scale.
The term "the blues" refers to the "blue devils", meaning melancholy and sadness; an early use of the term in this sense is found in George Colman's one-act farce Blue Devils (1798).[ Though the use of the phrase in African American music may be older, it has been attested to since 1912, when Hart Wand's "Dallas Blues" became the first copyrighted blues composition.In lyrics the phrase is often used to describe a depressed mood.