A type of country music played at a rapid tempo on banjos and guitars WordNet 3.0 & Open English WordNet

Bluegrass music is a genre of American roots music that developed in the 1940s in the Appalachian region of the United States. Wikipedia

A form of American roots music Wikipedia Disambiguation

form of American roots music; sub-genre of country music characterized by a quick tempo, with fiddle, banjo, and mandolin prominent Wikidata

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. Wiktionary

Style of country music. Wiktionary (translation)