Should prime ministers sing songs?

One of the videos currently available on the Sky News website is an extraordinary clip of prime minister Putin singing the Fats Domino hit I found my thrill on Blueberry Hill at a charity concert:

The sight of a prime minister singing took me back more than 30 years to the last time I remember seeing it happen - when James Callaghan kept the TUC guessing about whether he'd call an election in October 1978 (when he might well have won) or defer it to 1979 (which he did and lost to Margaret Thatcher) with his rendition of Marie Lloyd's Waiting at the Church.

On the basis of these two specimens, Putin comes across as the better singer of the two - and, unlike Callaghan, is unlikely to have done his future prospects any serious damage.