One wonders what the Broadway maestro would have made of “Stephen Sondheim’s Old Friends,” which opened Thursday at the Ahmanson Theatre in preparation for its move to Broadway in the spring.

Center Theatre Group and Pasadena Playhouse will present a special, one-night-only, benefit performance of Altadena and Eliot Arts Magnet’s production of Shrek The Musical JR. Learn how to attend.

Now playing a four-week run at L.A.’s Ahmanson Theatre in advance of hitting Broadway, “Old Friends” is hardly lacking for capable menfolk to round out its considerable ensemble of talent.

To watch these singers perform these numbers is to dream about entire revivals of Sondheim shows built around some of these actors, maybe even productions that have their genesis at the Ahmanson ...