No, not C S Lewis, but Michael Morpurgo's War Horse, a film version of which is due for release later in the year:
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Is it just me, or does the music by the inevitable John Williams seem completely wrong for the subject matter? This trailer for the new Spielberg film just doesn't pack a punch, although I'm sure that the film overall will be visually stunning.
One of the beautiful things about the stage show is the simple narrative folk singing composed by folk singer John Tams, of which a snippet can be heard in this promotional video for the play:
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I believe only one of his songs is included in the Spielberg film. :-/