Take a look at this Vulcan Gas Company handbill (Robert Rush art) promoting 3/1 & 2/1968 shows by Big Joe Williams & Conqueroo and Shiva's Head Band & Rubayyat. Rubayyat had Danny Galindo and they did that gorgeous cover of If I Were A Carpenter that appeared on the Epitaph for a Legend LP. They were also known as the Electric Rubayyat.
Big Joe Williams was an original Delta Bluesman who was signed to the legendary Bluebird label in the 1930s. There, he recorded such standards as "Baby, Please Don't Go" (1935) and "Crawlin' King Snake" (1941), both songs later covered by many other performers. Williams played a nine string guitar and was known as "King of the 9 String Guitar."