He spends hours in the studio and can illustrate a point about chord progressions in a song by playing them on a piano.

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But once you learn how to play an F chord you become more deeply absorbed in playing the guitar.

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Just as an example, note musical sketch from 2009 where comedy group Axis of Awesome amaze their audience by playing 36 modern pop songs over the same four-chord structure, in one long sequence.

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Note that, despite what you may have been playing in your local band, the variant of the chord is fixed and you can't vary it up: an open G chord can't be played with a barred G chord or any other different fingering.

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In the third movement, for example, the setting is rather odd, with the two top parts playing repeated notes in a slow tempo, whereas the bass line and the chord progression are slow with very little motion.

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The legal profession and its liberal supporters will accuse him of playing to the tabloid gallery, while many of those with whom he would once have struck a chord will dismiss it as just more talk from a prime minister whose time is running out.

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