Kings of Leon on Mick Jagger, lockdown hair and writing songs on bar napkins

Perhaps understandably, their next record, Mechanical Bull, played it safe, sticking to the arena rock anthems they’d become known for. But they shook things up on 2016’s Walls, bringing in Arcade Fire and Florence + The Machine producer Markus Dravs, who located a darker, more sinister side to their signature sound.