How Hits Were Made on Instagram: "You hear it from the first bar. Coldplay hands the keys to Avicii and the song opens like a piano confession before exploding into progressive house. A Sky Full of Stars arrived on 2 May 2014 as the second single from Ghost Stories and the band co wrote and co produced it with Avicii, with additional production by Paul Epworth, Daniel Green, and Rik Simpson. Chris Martin later told Zane Lowe on BBC Radio 1 that he asked Avicii to play the piano and felt like he