Opening credits sequence & footage (4 seasons; 96 x c.25-min episodes) Opening theme(s): When Were Singin (1970–1971) Cmon, Get Happy .brOpening credits sequence (2 series; 24 x c.50-min episodes). The theme music to – “Light Flight” by the British folk rock group Pentangle -- was a British chart hit .brClip from the UK TV series Doctor in the House (1969--70) (1 season; 26 x c.30-min episodes)brOpening credits sequence (1 season; 30 x c.