Reading Festival “warm-up” was right. It was unbearably hot in Brixton Academy, while the long-running American pop-punk band who aren’t Green Day prepared for their festival headline slot at the end of this month. Hard-rocking Reading has always held a torch for this frenetic, goofy sound, even when its fortunes have waned, though there is renewed interest right now thanks to current schoolgirl favourites 5 Seconds of Summer, who profess deep love for Blink 182 and their tattooed ilk.