Weird trends in popular music?

For some reason, a lot of late 2000s pop rock hits had random crowd/stadium chanting breaks (i.e. Gives You Hell, Shake It by Metro Station and Good Girls Go Bad by Cobra Starship) and i've never gotten why

For some reason, a lot of late 2000s pop rock hits had random crowd/stadium chanting breaks (i.e. Gives You Hell, Shake It by Metro Station and Good Girls Go Bad by Cobra Starship) and i've never gotten why