The autoharp that I played on for the Walton's Theme and for the other score Jerry Goldsmith used for the Walton's pilot, a Christmas special called "The Homecoming" was a fifteen bar (Eb,D,F7,Gm,Bb,A7,C7,Dm,F,E7,G7,Am,C,D7,G) with rounded corners and a slight round indentation for holding it on your knee or forearm.

I also played this harp on a movie called "The Wild Rovers" and it was featured in the intermission part of the movie (on DVD).

It may be one of the few times this instrument was featured with a full orchestra on a movie score.

I sweated out the tuning by placing the wrench on the tuning pegs and retuned constantly while the orchestra was tuning up but it held its tuning well.

Jerry's daughter played it on subsequent episodes of the Waltons. She was a folklore student (I think at Oberlin).

I played dulcimer on "The Homecoming" also. .