With roots in blues, jazz, and the traditional ballads and dance tunes of the British
Isles, by way of Appalachian musical tradition. Pioneered by and named for Bill Monroe
and the Blue Grass Boys, who began playing in the style in the mid-1940s. Traditional
instrumentation includes the guitar, mandolin, fiddle, banjo and bass, though bluegrass
groups may feature other instruments such as the dobro, piano, and accordion. Guitarists
typically flatpick, bassists play the root and fifth in a pizzicato style, and fiddlers
play in thirds and fifths while vocalists harmonize in two to four parts, often with
the highest voice singing dissonant or modal harmony. Bluegrass is often virtuosic
and rapidly played. As in jazz, different instruments typically take turns stating
and improvising around the melody.
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