From the film Hootenanny Hoot (1963), an entirely different space and time. God, Youtube can seriously do some marvels.
The two's focus was creating harmony with Joe singing tenor and Eddie singing baritone. The rich blend created the sound that identifies Joe and Eddie. Throughout each album, the music stays raw, simple and within the genres of African-American gospel music, folk tunes, and Blues with a little jazz flavor. Songs contain little background instrumentals, since the "main objective was to focus on Joe & Eddie's singing...". This duo was known for their "rapid-fire delivery" and vocal improvisations, as can be heard in the songs "Green Grass" and "Children Go". - Wiki