Tony Benn on James Callaghan singing
17 March 2014 Last updated at 17:02 GMT
Veteran left-wing campaigner Tony Benn, who has died at the age of 88, recalled in his audio diary a meeting with James (Jim) Callaghan after he was appointed as prime minister after Harold Wilson resigned in 1976.
Tony Benn explains that the new prime minister would sing on occasion - particularly when his guard was down.
This is a clip from the first series of The Benn Tapes, first broadcast on BBC Radio in 1993.