The first two series were mostly produced by Dennis Main Wilson; none of the episodes was given an individual title and these early shows were loosely structured and consisted of four or five unconnected sketches, separated by musical items. According to later producer Peter Eton, the musical segments took up around half the programme.:113 In this formative phase the show co-starred Milligan (who played only minor roles in the early shows), Sellers, Secombe and Michael Bentine as the nominal 'hero' of each episode, madcap inventor Dr Osric Pureheart.:124 Musical performances were by virtuoso jazz harmonica player Max Geldray, singer Ray Ellington and his quartet (both of whom were recruited by Dixon) and vocal group the Stargazers, but they left after Episode 6 of Series 2, and for the remaining episodes Secombe filled in, singing a straight vocal number.:124 Incidental, theme and backing music was provided by Stanley Black and the BBC Dance Orchestra.:127 Series 2 also saw the first appearances of popular characters Minnie Bannister (Milligan) and Henry Crun (Sellers).