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From the band Blue Grass Boys, led by Bill Monroe; bluegrass is first attested in print in reference to the genre of music in 1956.
- (uncountable) A style of country music with roots in Scots-Irish Appalachian folk music, blues, and jazz and characterized by banjos, fiddles, acoustic guitars, dobros, and mandolins; but containing no drums, electric guitars, pianos or other keyboard or wind instruments.
- 2001. The Garland Encyclopedia of World Music: North America. Garland Publishing. Ellen Koskoff (Ed.) Pgs. 158-159.