Billboard's Top Producers of 2013 -- 1. Ryan Lewis

In Australia they're called "op shops."

Thanks to his international smash hit, and six-week Billboard Hot 100 chart-topper "Thrift Shop," Ryan Lewis, 25, has newfound knowledge of and appreciation for thrifting culture around the world. Wherever Lewis and Macklemore, the rapper and his key collaborator, travel in support of their platinum debut album, "The Heist," fans unfailingly regale the Seattle duo with tales of their own adventures in second-hand clothes shopping -- a pastime with unexpectedly universal appeal.