bluegrass

Etymology 1

blue + grass, from the bluish appearance of the massed grass in late Spring.

noun

1. Kentucky bluegrass, Poa pratensis.

Etymology 2

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.

noun

1. (music, uncountable) A subgenre 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.