LONDON (Reuters) - American singer Meghan Trainor was propelled to the number one spot in the British singles chart on Sunday by a surge in sales and online demand for her upbeat pop track "All about that Bass", the Official Charts Company said. Trainor's song was listened to more than 1 million times online, helping it dethrone "Bang Bang" by pop trio Jessie J, Nicki Minaj and Ariana Grande, which charted in second place. Taylor Swift's "Shake it off" held firm in third place, with Sigma's "Changing" and "Blame" by Calvin Harris coming in at numbers four and five respectively. ...

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