Bluegrass music is a genre of American roots music that developed in the 1940s in the United States Appalachian region. The genre derives its name from the band Bill Monroe and the Blue Grass Boys. Bluegrass has roots in traditional English, Irish, and Scottish ballads and dance tunes, and by traditional African-American blues and jazz. Bluegrass was further developed by musicians who played with him, including 5-string banjo player Earl Scruggs and guitarist Lester Flatt. Bluegrass pioneer Bill Monroe characterized the genre as: "Scottish bagpipes and ole-time fiddlin'. It's Methodist and Holiness and Baptist. It's blues and jazz, and it has a high lonesome sound.

Bluegrass features acoustic string instruments and emphasizes the off-beat. Notes are anticipated, in contrast to laid back blues where notes are behind the beat, which creates the higher energy characteristic of bluegrass.[1] In bluegrass, as in some forms of jazz, one or more instruments each takes its turn playing the melody and improvising around it, while the others perform accompaniment; this is especially typified in tunes called breakdowns. This is in contrast to old-time music, in which all instruments play the melody together or one instrument carries the lead throughout while the others provide accompaniment. Breakdowns are often characterized by rapid tempos and unusual instrumental dexterity and sometimes by complex chord changes.

--wikipedia

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