If you were to ask me who the most popular band in 2021 is, I'd have to say the Jonas Brothers. This is my own personal bias as a Jo-Bro stan for 12+ years, but they're also totally dominating music right now. Well, they were before time stopped a year ago, but you know what I mean.
You know who else I'd say?
Adam Levine Maroon 5! And Imagine Dragons! Coldplay! The 1975! And of course, the friggin Arctic Monkeys.