They balked at 'boy band' and, with the help of pop-punk all-stars, have cranked out ferocious new songs about depression, anger and alienation. Says drummer Ashton Irwin: 'People our age, we all feel like s—t about ourselves'
Music's 40 Under 40 - The young disruptors who call the shots for Fallon, The Weeknd and Lady Gaga
1D (One Direction) Takes Aim at Biebs (Justin Bieber)- Behind the same-day release battle to debut at No. 1
On the Cover: 5 Seconds of Summer; Clockwise from left: Michael Clifford, Calum Hood, Luke Hemmings, and Ashton Irwin