New-school troubadour Jon Bellion might be best known for “All Time Low”, his glitchy break-up song that hit big in 2016. Behind the scenes, though, he’s helped write glittery, hooky songs for some of pop’s biggest names, like Miley Cyrus’ roller-disco mood piece “Midnight Sky”, Christina Aguilera’s storming Demi Lovato collab “Fall in Line” and Justin Bieber’s gospel-tinged Chance the Rapper duet “Holy”.