The pilot episode (at that time titled "I'm Sorry, They're At It Again") opened with Graeme Garden and Jo Kendall singing the words of "Three Blind Mice" to the tune of "Ol' Man River" followed by Bill Oddie and Tim Brooke-Taylor performing the lyrics of "Sing a Song of Sixpence" to the melody of "These Foolish Things". Dave Lee, who was bandleader on "I'm Sorry I'll Read That Again", was at the piano and a number of rounds were introduced by a short phrase of music. Other rounds included "Dialogue Read in a Specific Accent" and "Songs Sung as Animals". In 1974 Bill Oddie was replaced by Willie Rushton, with Barry Cryer as Graeme Garden's teammate, and Humphrey Lyttelton as chairman, and the personnel remained constant from this point until Rushton's death in 1996, although occasional guest panellists appeared in the 1980s and early 1990s (see below). Since then the fourth seat on the panel has featured a variety of guest comedians.