"Pitch Perfect 2," the follow-up to the 2012 surprise hit, doesn't produce glory, but it definitely supplies glee. Anna Kendrick, Rebel Wilson and the rest of the a cappella Bellas gang are on top of the world until a mishap gets them barred from further performances. The only way the troupe can return to the stage is by winning the upcoming global contest, where no U.S. team has ever triumphed. There's a symphony of one-note humor here, plus a roster of giggly surprise appearances by music, sports and TV celebrities playing themselves. Better are the ace character roles from comics Keegan-Michael Key as Kendrick's boorish boss and David Cross as a batty fan.