Broken Social Scene don’t make albums anymore. No, that Canadian group hug now presents, or at least one of their members presents themgives them a formation, arms them, and sends them out to battle. Last time out it was Col. Kevin Drew organizing the troops, but this week it is time for Maj. Brendan Canning to step forward and give shape to this rabble of Canadian musicians all at the top of the world’s indie-rock hierarchy. Somehow, in all their multiple guises, every time I see or hear them, they all put their fists to the sky and summon something powerful, breezy, and communal. Canning drives his minions hard in Church Under the Stairs, and this is familiar territory for B.S.S.they excel in this new quest to win new hearts and minds.