The drummer of rock band Keane said today that he was "horrified" that their song was played at the Tory manifesto launch.
Richard Hughes said on Twitter that the Conservatives had not asked the band's permission to use their 2004 hit Everybody's Changing.
He told his 2,000 followers that he would not be voting for them.
Around 500 Tory candidates, new party members and supporters were in the audience at Battersea Power Station to hear David Cameron's speech.
Music played to the crowd before the speech also included David Bowie's Changes - echoing the "Vote for Change" slogan displayed on banners.
Hughes tweeted: "Told the Tories played Keane at their manifesto launch. Am horrified. To be clear - we were not asked. I will not vote for them."Keane hit the big time with the release of their debut album Hopes And Fears in 2004. They are famed for using the piano as lead instrument rather than guitar.