'Fosse/Verdon' choreographs FX's latest look at old Hollywood

Sam Rockwell, Michelle Williams in 'Fosse/Verdon.'

(CNN)If concept and casting are half the battle, "Fosse/Verdon" earns a curtain call before the overture. Sam Rockwell and Michelle Williams play director Bob Fosse and star Gwen Verdon, whose tumultuous relationship and partnership provides another delicious window into