bluegrass isn't just played by southerners any more - although it's still rare to find an [african-american] bluegrass musician
"an old fashioned style of [country] music dating from the late [1930s] pioneered by [bill monroe] (who invented the name) and [roy acuff]
"bluegrass isn't just played by southerners any more - although it's still rare to find an [african-american] bluegrass musician" What is the definition of "bluegrass"?