5 Seconds of Summer, often abbreviated as 5SOS, is an Australian pop rock band formed in 2011. The band consists of four members: Luke Hemmings, Calum Hood, Michael Clifford, and Ashton Irwin. They were originally formed as YouTubers, posting covers under the channel name hemmo1996, now going by their abbreviation. They quickly rose to international fame when touring with English-Irish boy band One Direction on their Where We Are Tour. In February 2014, they released "She Looks So Perfect" as their debut worldwide release. It topped the charts in Australia, New Zealand, Ireland and the United Kingdom.