In the opening number of Bright Star, the bluegrass musical playing at the Ahmanson from Steve Martin and Edie Brickell, plucky heroine Alice (a powerhouse Carmen Cusack) belts out “If You Knew My Story” with the addendum that “you’d have a good story to tell,” which is a bit misleading since the story is the weakest part of the show. Everything plays out exactly as expected. It’s not bad, it’s fine, everything is perfectly fine. It’s just completely weightless.