Teenage Fanclub cranks out sweet harmony

If they had to, the musicians in Teenage Fanclub could cloak many weaknesses with their sweet melodies and delicious harmonies. But when the vocals are as perfect as they were at the band’s Chicago debut Friday night at the Cabaret Metro, it really doesn’t matter how profound or inane the lyrics are. At their sold-out show, the group dished up the same savory vocals that are featured on its current LP “Bandwagonesque,” but with the added bonus of cranked-up instrumentation.