Australian pop rocker band 5 Seconds of Summer consists of Luke Hemmings (vocals, guitar), Michael Clifford (guitar, vocals), Calum Hood (bass guitar, vocals)and Ashton Irwin (drums, vocals). 5 Seconds of Summer began in December 2011 when Luke, Michael and Calum, who all attended the same school (Norwest Christian College), joined together and started posting videos of themselves performing covers of popular songs to YouTube. In December 2011, they were joined by drummer Ashton and the current 5 Seconds of Summer lineup came to be. 5 Seconds of Summer are supporting One Direction on their 2013 world tour!