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One Song To The Tune Of Another is a game played on the BBC Radio 4 comedy panel game I'm Sorry I Haven't A Clue. It consists of panellists singing the lyrics of one song to the tune of another song which is being played on a piano. It can be viewed as a variant of karaoke, but predates karaoke's rise to popularity by many years.
The panellists often sing in teams of two, presumably to compensate for the weakness of a single voice in this rather difficult task. (The panellists are comedians with no special musical skill.) The pianist (usually Colin Sell) will also assist by varying the timing of his playing to match the uneven tempo of the singers.
Some of the humour derives from the incongruity caused by differences between the songs involved. They may differ wildly in genre, structure, tempo, and time signature. Sometimes apparently-incompatible songs surprisingly turn out to fit well together.
Additional humour is derived from the manner in which the host, Humphrey Lyttelton, introduces and explains the game. The concept is actually simple, and well described by the game's title, but Humph claims it to be complicated and proceeds to give a long-winded and complex "simple" explanation, which differs each time the game is played. For example:
Internet-based fans have taken the silliness a step further, in true ISIHAC style, by playing the game in text-based media, such as USENET and email. Liberal use of punctuation can give readers a hint of how the metre is being applied to the lyrics.