Hi student. There are as many answers and theories as there are Bluegrass fans. The music is a hybrid of lots of traditional styles, but some think (and I'm one of 'em) that the first night Earl Scruggs joined Bill, Lester Flatt, Chubby Wise, and Cedric Rainwater on the WSM Grand Ol Opry, Bluegrass (as we know it) was born.

Rick