Inside Out

A softer-edged song than The Chainsmokers' previous single releases, this features vocals by Austrian electropop singer, Charlee. Chainsmokers said: "Basically we discovered Charlee through our buddy Adrian Lux. We asked him to put us in touch and we really hit it off. She had such an incredible voice and we didn't even know about her song writing yet. We sent her a demo called 'Halo' we had done and within a week she had sent us back one of the most dark and emotional toplines we have yet received."

Charlee is best known in her native country for "Boy Like You." The song, co-written by Kesha, was released in August 2010 and reached the Top 20 in Austria.