Sing, dance and act all at the same time? Sure, nothing to it. Chorus lines do it every day. Of course, the classic Broadway musical “A Chorus Line” makes it clear just how challenging that can be.

Performances in N.Y.C. Critic’s Notebook The slinky jailbirds and Broadway hopefuls in these two classic shows have been fighting it out since 1975. Merry murderesses: Penny Worth and Carolyn Kirsch ...