The new mandolin rage corresponds with the rennaisance of acoustic music in general. It was the folk music movement of the 60’s that laid the acoustic foundation. People liked this natural sound. It was real, and hey, I think I could play and sing that music, also. Millions did and along the way, discovered all things folk and acoustic, including the mandolin. The folk movement led people to discover Bill Monroe and his follower groups including Flatt and Scruggs.