I never knew this, I always thought that Billy was the one who played the banjo in Deliverance. You talk about talent, the guy who was behind him who I cannot find the name of was the actual one who played it.
In Deliverance, during the “dueling banjos” scene, Billy Redden, who played the young banjo-playing local, didn’t know how to play banjo. To make it look authentic, a skilled banjo player hid behind & played the chords with his left arm in Redden’s sleeve while Redden pick
https://youtu.be/myhnAZFR1po