5 Seconds of Summer (commonly abbreviated as 5SOS) are an Australian rock band from Sydney that formed in 2011. The group were originally YouTube celebrities, posting videos of themselves covering songs from various artists during 2011 and early 2012. They rose to international fame while touring with One Direction on the Take Me Home Tour. 5 Seconds of Summer's musical style has been described as pop punk, pop rock and power pop. Rolling Stone magazine called them "emo-gone-pop". The band consists of Luke Hemmings (lead vocals, rhythm guitar), Michael Clifford (guitar, live keyboard, vocals), Calum Hood (bass guitar, vocals), and Ashton Irwin (drums, keyboard, vocals).