The Sun Comes Out Tonight heralds the return of Bob Marlette in the roles of producer and co-writer, and marks the introduction of Filter's newest addition, co-writer, and guitarist, Jonny Radtke. Hailing from Chicago, Illinois, Radtke's rapturous vocals and elegantly furious guitar playing mesh expertly with Filter's ambiance. "Jonny is the little brother-slash-guitar player I never had, he's just incredibly talented," Patrick affectionately admits. "Because of his talent and my connection with him, it was such a joy to make this album, it's a very inspired record. The chemistry was there. I really can't say enough about Jonny." Radtke's own predilection for rebellion and versatility are hallmarks of his own one-man musical project, the ethereal Polar Moon. Prior to joining Filter, Radtke's guitar stylings were best known for gracing the stage with his previous band, Kill Hannah, and the live incarnation of Ashes Divide, led by Billy Howerdel of A Perfect Circle.