An expantion of jock-rock which is the male parallel to the boy band; any music that causes "Bros" to enter a state of wild abandon, swinging their arms violently, spilling beer and lip-syncing every lyric perfectly, essentially causing them to act like club-girls.
Examples of Bro-Bands include Blues Traveler, Dave Mathews, The Dispatch, James Blunt, O.A.R., and others.
"It's like they've turned Madison Square Garden into a giant frat house."
"Well what did you expect? They're a Bro band."