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Carling is targeting Londoners on the Underground with a field marketing campaign promoting its sponsorship of licensed busking on the Tube. The joint promotion with pub group Mitchell & Butler, created by WWAV Rapp Collins, will give 50,000 commuters free-pint vouchers redeemable at 46 pubs in travel zone one. The vouchers take the form of a mock CD and invite consumers to get their daily music fix with Carlinglive's buskers.