MAGIC MAN Mixing genres and producers, chart-topper Jason Derulo conjures up his own brand of pop By Russell Hall Jason Derulo’s songs are fixtures on the pop charts, but he’s hesitant to label his music as simply pop. He’s proud of his many influences, and his latest album, Everything Is 4, features an array of musical styles. For some artists, that could spell a lack of cohesion, but Derulo’s collection gels through the sheer force of his...