who posted videos of themselves covering songs from various

vocals). The group were originally YouTube celebrities， vocals)， vocals) and Ashton Irwin (drums， vocals 5 Seconds of Summer (also known as 5SOS) are an Australian pop punk and pop rock band. Formed in Sydney in 2011， the band consists of Luke Hemmings (lead vocals， guitar Michael Clifford - guitar， Michael Clifford (guitar， Calum Hood (bass guitar， who posted videos of themselves covering songs from various artists in 2011. ， guitar)， vocals Calum Hood - bass guitar， vocals Ashton Irwin - drums， About 5 Seconds of Summer Band Members Luke Hemmings - lead vocals，。