Music for the original 1981 series was by Bryan Daly, who wrote a number of songs including the well-known theme tune. For the 2003 series, pop writer Simon Woodgate scored the show and wrote new songs, including a new closing theme "What's in His Bag?". The theme tune "Postman Pat & His Black and White Cat" was sung by Ken Barrie for the original series in the 1980s and '90s. An extended version of the tune was released as a single in the UK where it reached number 44 in the charts in July 1982.