Since his career as a hitmaker first took off with Kelly Clarkson’s 2004 smash “Since U Been Gone,” Lukasz Gottwald — a.k.a. Dr. Luke, Tyson Trax and others — has reigned as one of the world’s top hitmakers via songs with Miley Cyrus’ “Wrecking Ball,” Katy Perry’s “California Gurls,” Britney Spears’ “Hold It Against Me,” […]