Have to tell you, King Richard's Fluegel Knights is one of my guilty pleasures. I have the albums. Come On Over would have made a good game show theme too.
Fun fact: Bobby Darin was friends with King Richard himself (aka Dick Behrke) and had him on his variety show along with Geoff Edwards, the host of Bob Stewart's 1971 Says Who? pilot...which used Horn Duey as its theme.
Fun fact 2: Behrke made the move into commercial jingles in the early '70s. Here's a song he arranged for the 1972 Chevrolets. Jake Holmes wrote and sang.