Bluegrass Definition:

The term bluegrass is a nickname from the "Bluegrass State," Kentucky, that was applied to the music of Bill Monroe and his Blue Grass Boys in the late 1940's. Bluegrass music is an acoustic ensemble music characterized by fast tempos, improvised instrumental solos and close (high) harmony parts. The primary instruments found in bluegrass music are the guitar, the mandolin, the upright bass (or bass), the three-finger style banjo, the dobro and the fiddle. Bluegrass music evolved from music indigenous to the Southern Appalachian Region in the early 1900's including fiddle tunes, folk songs and blues.

Here's my post. I think Old-Time music uses a clawhammer or frailing style banjo.

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Richie