A kind of folk music for guitar, banjo, violin, other stringed instruments, and voice; bluegrass is distinguished by rapid notes and improvisation by the musicians.
: the bluegrass sound/ bluegrass mandolin by Bob Applebaum
nounMusic based on the songs and dances of the Southern Appalachians and played usually at a fast tempo by a string group
[fr the nickname of Kentucky, the Bluegrass State]