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In page Utopia (Doctor Who):

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Music originally composed for Torchwood can be heard in the background of this episode: a variation of the Torchwood theme plays when Jack runs towards the TARDIS and a motif plays when Jack lies dead, having ridden on the TARDIS through the Vortex. The drumming motif is suggestive of the fifth and subsequent bars of the Doctor Who theme tune as composed by Ron Grainer and realised by Delia Derbyshire.[1]