The pop/rock band 5 Seconds of Summer formed while Hemmings, Clifford, and Hood attended Norwest Christian College together in Sydney, Australia. They would all drop out to pursue music.
The original trio gained a following by posting YouTube videos of cover songs, including Mike Posner's "Please Don't Go" and Chris Brown and Justin Bieber's "Next 2 You." Shortly after, they recruited Ashton Irwin as their drummer.
The group's popularity exploded after One Direction's Niall Horan and Louis Tomlinson tweeted shout-outs to them after watching one of their videos (it was later revealed that 1D had a financial interest in 5SOS). 5 Seconds of Summer would be the opening act for One Direction on their 2013 Take Me Home tour and their 2014 Where We Are tour.
Clifford had a brief relationship with actress-turned-singer Abigail Breslin. He claims her 2014 single "You Suck" was written about him. The lyrics single out the scar above his eye, his "fly to the moon" tattoo, and his formerly bleached hair.
The band's self-titled debut album peaked at #1 in 11 countries, including the US.
5 Seconds of Summer refuses to accept the "boy band" label. "That implies that we don't play and we don't write our own songs," Hemmings told The Sun-Herald. "It makes us seem a bit fake."
Hood has several tattoos, including ones of his father's and mother's initials on his hands.
Hood's sister, Mali-Koa Hood, competed on the first season of The Voice (Australia).
The #vote5sos hashtag was used to unite fan army votes for 5 Seconds of Summer around the 2014 American Music Music Awards. It was the biggest music-related hashtag to emerge in 2014.
Michael Clifford was the genius behind 5 Seconds' band name. He came up with it during math class.