Nick Kaelar (born Nick Pittsinger, May 15, 1990), better known by his current stage name Varien, is an American composer and producer. While primarily an electronic music producer, Kaelar has incorporated or experimented with styles of Epic Music, metal, orchestral, Neofolk, and ambient music. He is known for his unconventional approach to electronic music, focusing on immersion and storytelling and including many live instruments not normally found on electronic tracks. Featured on a number of labels, mainly Monstercat, many of Kaelar's tracks under the Varien moniker (including "Cloak and Dagger", "Valkyrie" and "Gunmetal Black") have surpassed a million views on YouTube and made worldwide sales. His music has been featured in many mainstream films and television series such as Furious 7, The Walking Dead, 300: Rise of an Empire, The Purge: Anarchy, and The Real World, among others.
Kaelar has undertaken other non-composing accomplishments include helping develop multiple sample libraries for 8dio Productions, led by composer Troels Folmann and providing music production tutorials on YouTube, which have accumulated over 1,000,000 plays total. Other past aliases of his include Shamantis and Halo Nova. As a side project, Kaelar also produces music for American television series and commercials under the alias Chrono Rabbit. In 2016, Varien announced a new alias, Koinu, which he uses as "a mix of hard EDM and jpop/anime aesthetics."