Watch Sadisflix. Flatt & Scruggs are one of the most popular and respected bluegrass bands of all time. Along with Bill Monroe, they propelled this great style into a widely successful and artistically praised musical format. They were star attractions at the Grand Ol' Opry for many years. The performances in these DVD showcase Flatt & Scruggs in their prime with their group the Foggy Mountain Boys playing many of their most famous songs.