Brockhampton (and their fans) rocked the Fillmore on Sunday night

I’ve seen everyone from One Direction to New Kids on the Block to 5 Seconds of Summer to the Jonas Brothers. With that being said, I’d consider myself a boy band expert. But even this "boy band expert" wasn’t prepared to experience Brockhampton live. Brockhampton is a self-described musical group that originally formed in Texas.…