5 Seconds of Summer began in July 2011 (Unsure of official month, so I’m using the month they posted the “Next To You” cover)(UPDATE: The official ‘birthday of 5sos is December 3rd) in Sydney, Australia, when Luke Hemmings, Michael Clifford and Calum Hood, who all attended the same school started posting videos of themselves doing covers. They posted under Luke’s youtube channel, hemmo1996, which they still use today. In December 2011, they were joined by drummer Ashton Irwin, to play their first gig at the Annandale Hotel in Sydney. Ashton then became a permanent member of the band.
They released their first EP, Unplugged, June 26, 2012. On this EP were the songs Too Late, Gotta Get Out, Jasey Rae (All Time Low Cover) and I Miss You (Blink-182 Cover)
In October 2012 they toured Australia supporting Hot Chelle Rae and Cher Lloyd.
Then, on December 7, 2012, they released the Somewhere New EP. This one included Out of My Limit, Beside You, Gotta Get Out, and Unpredictable.
It was announced on February 12, 2013 that they would be opening for One Direction on their “Take Me Home” tour which kicked off February 23, 2013.
On May 16, 2013 they announced a short Aussie tour, upon their arrival home for the first time in 6 months.
They finished up the TMHT in November 2013, and returned to the UK November 8, 2013.
They got signed by Capitol Records and opened their own label called “Hi or Hey Records”
They began their own headlining UK tour in February 2014, to be followed by a US tour beginning in April. They are soon to release their She Looks So Perfect EP.
List of all of their songs here