German producer and electronic musician Paul Kalkbrenner has achieved a level of success uncommon for an artist associated with the techno underground. Since the late 1990s, he's continually refined his style of warm, melodic tracks rooted in minimal techno and early trance. Following well-received albums such as 2004's Self, he made a major breakthrough in 2008, when he starred in and composed the soundtrack for the film Berlin Calling, which included the era-defining single "Sky and Sand," sung by his brother, Fritz Kalkbrenner. Without modifying his sound for the mainstream...