Runaway ( U & I ) " is a song by Swedish electronic music duo Galantis . It was released on 5 October 2014 as the lead single from their debut studio album '' Pharmacy '' ( 2015 ) . The song features uncredited production work by Svidden , as well as Julia Karlsson performing the chorus and Cathy Dennis performing two verses on heavily processed and uncredited vocals . " Runaway ( U & I ) " became Galantis ' biggest hit single to date . In early 2015 it achieved chart success on the Australian Singles Chart reaching number four , and on the New Zealand Singles Chart , where it peaked at number six . It also debuted at number four on the UK Singles Chart and has since sold over 600,000 units to date , giving it a Platinum certification by the British Phonographic Industry . The song was written by Anton Rundberg , Julia Karlsson , Linus Eklöw , Christian Karlsson , Jimmy Koitzsch and Cathy Dennis . '' Billboard '' ranked the song at number five on its " The 10 Best Electronic/Dance Songs of 2014 " list . " Runaway ( U & I ) " received a nomination for Best Dance Recording at the 58th Grammy Awards
58th Grammy Awards
58th Annual Grammy Awards
Runaway (U & I)