After a breakthrough in 2014, he was asked by Coldplay vocalist Chris Martin to create a remix for the song "Midnight". On December 1, 2014, he released his first single "Firestone", featuring vocals from Conrad (mononym for Conrad Sewell). In February, he released the official Ultra Music Festival theme song, "ID". On March 15, 2015, he released his third single, titled "Stole the Show".
Kygo started to learn to play the piano at age six through lessons.He stopped when he was 15 or 16 and started producing music with Logic Studio and a MIDI keyboard while watching several tutorials on YouTube.
After receiving over 80 million views on YouTube and Soundcloud, Kygo was contacted by both Avicii and Chris Martin of Coldplay to create official remixes of one of the artists' songs. He has also supported Avicii at Findings Festival in Oslo, Norway, in 2014. On 19 September 2014, it was confirmed that Kygo was to replace Avicii at mainstage in TomorrowWorld, due to Avicii's health concerns. Kygo is also set to play various events in North America, and some of the shows have already been sold out. He also got a feature interview in the official Billboard magazine, where he talked about his remixes for Diplo and Coldplay, and talked about his upcoming tour in North America. In July 2014, Kygo partnered with EDM lifestyle brand Electric Family to produce a collaboration bracelet for which 100% of the proceeds are donated to breast cancer awareness. In that same month, he scored a huge record label deal with Sony International and Ultra Records. In February 2015, his new song "ID" which was featured in the official trailer for Ultra Music Festival In August 2015, Kygo was a featured headliner at Lollapalooza in Chicago, one of the biggest music festivals in the world.