Found this wonderful site. There’s a great image of Ken/Festus on the home page. It opens with Ken singing a lovely song, so don’t forget to turn up the volume.
http://www.eviltwin.velvetsofa.com/Curtis/main.html
Here’s another beautiful song by Ken Curtis, MamaB.
http://www.youtube.com/watch?v=u_3P53pdqrk&feature=related