Pop delivered with bright eyes, huge hooks and perfect hair, this second album sees the former YouTube sensations shimmy out of the boy band long grass and into accomplished pop-rock territory. They achieve this with a robust injection of attitude. The EDM-pulse and sharp rhymes of guest star Silentó on the aptly-named “Volcano” triggers the shift, the mature “Boy Without a Car” motors through with chugging guitars and a strident chorus and “Worry” is the sort of arresting, urgent lovelorn anthem that highlights their maturation.