Derek Vincent Smith calls his fourth album, "A Color Map of the Sun" (July 2, Pretty Lights Music), "the most challenging, massive project" he could envision. The DJ/producer, who performs as Pretty Lights, certainly put in his time. The album, the first Pretty Lights LP to get a proper physical release in addition to being available for free download, has been in the works since 2010. "It's something that I'd always wanted to do and I was always working toward," he says.

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