<P> In late March 2014, their single "She Looks So Perfect" was released in UK . Despite spending only one day on top in the British iTunes store and ending its week in the lower end of the top 10, 5 Seconds of Summer became the fourth Australian band to have a UK number - one single, and the first to do so in 14 years . On 9 April, their third EP She Looks So Perfect debuted at number 2 on the Billboard 200 Chart . </P> <P> On 9 May, they released their second single, "Don't Stop". It debuted at number 2 on the UK Singles Chart, 3,000 units behind Ella Henderson's "Ghost". It peaked at number one in 4 countries and was in the top 10 of 8 countries overall . Billboard said that, "In the vein of Green Day's "She" and Blink - 182's "All The Small Things," "Don't Stop" is 5SOS' bid for a deceptively charming pop - punk anthem, with lyrics that are stickily sweet in their awkward flirtatiousness . The bridge could be more polished, but that hook is a highlight of the whole album ." On 15 June, the band released their fourth EP Don't Stop which was not available to purchase in the US, Canada and Mexico . </P> <P> On 13 May, the band announced that their debut self - titled album would be released on 27 June 2014 in Europe and Australia, with other releases coming later . The album won a Kerrang! award; Luke Hemmings said it was a real honour to win one, as all the band's idols are in Kerrang! . The album debuted on the top of the Billboard 200 Chart, peaked at number one in 13 countries, and peaked in the Top 10 of 26 countries . </P> <P> On 15 July, the band released their third single, "Amnesia", which was the only song not written by the band members themselves, but by Benji and Joel Madden of Good Charlotte, an American pop punk band . Billboard said of the track that, "With a surprisingly affecting vocal performance and the most searing lyrics on the album, new single "Amnesia" establishes itself as 5 Seconds of Summer's successful Serious Pose . Taking older listeners back to the relative heartache of dissolving high school romance, "Amnesia" demonstrates the versatility of 5SOS, and one wonders why it's buried at the end of the group's debut album ." On 5 September, they released their fifth EP Amnesia which was not available in US and Mexico . </P>

Where did the name 5 seconds of summer come from