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Katy Perry is the top-earning musician of 2015, according to Forbes' annual list. Following the conclusion of her 17-month Prismatic World Tour, she earned $135m, which saw her jump from 23rd place last year. One Direction come in at number two after their On the Road Again Tour and album release, with earnings of $130m. But there are also some surprises on the list: country music star Garth Brooks came in third place, while 1970s rock group the Eagles managed to beat Beyonce. Picture: Katy Perry performing on stage. Picture credit: Getty Images.
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