What mistaken idea did some americans have about the appeal of bluegrass music?

That they were just a bunch of hippy s and the purpose they do this all for is not what they do it for but yet do they no there wrong there trying to get more people to like classical music and raise the rate of more people liking old timey music in stead on hip-hop and rap even though those kinds of musics are good they still want more people in the classical sisitty.   hope i helped :)