I love this clip, from the film, "Deliverance". I found the film very disturbing but this musical interlude is enough to forgive the rest.
Incidentally the boy who played the hill-billy banjo player, Billy Redden, couldn't play the banjo at all. The real player was behind him, in the shots, with his arms through the sleeves of a "special" shirt so it looked like Redden was playing.