While watching Gunsmoke, I decided to look up Ken Curtis to see what if anything he did besides Festus Haggen. I was shocked to find this: <iframe width="420" height="315" src="//www.youtube.com/embed/fWR6FLnPack" frameborder="0"></iframe>
Wow, I'd never have figured him to have that mellow smooth voice. Of course you'd never figure Jim Nabors to have the singing voice that he did after listening to him as Gomer Pyle.