The casts of A Gentleman's Guide to Love & Murder and iLuminate were also on hand for the weekly outdoor concert.
The Deafening and Reserved for Rondee headlined a night of rock and roll, Broadway-style.
American Idol finalist Maroulis originated the role of Drew in the Broadway musical.
Tony Award winner John Rando will direct.
Barbara Cook was presented with the Julie Harris Award at the annual event.
Nancy Opel, Jim Stanek, and Kate Wetherhead will also participate in the theater's tribute to Joe DiPietro.
The off-Broadway institution held its annual bowling gala on Monday night.
Broadway's hottest rock stars hit the stage to support The PATH Fund.