Rice, who appeared as Johanna in the original Broadway production of Sweeney Todd, will join that musical's original leading man for the 7 PM concert. Cariou earned a Tony for Sweeney and also originated the role of Frederik Egerman in A Little Night Music.

In addition to Rice, Murney, Burgess and Leung, Cariou will be joined by special guests including Lisa Asher, Natalie Douglas, Larry Hamilton, Joe Iconis, Trent Armand Kendall, Phyllis Pastore, Marybeth Purdy, Anne Runolfsson, Nikki Scalera, Stephen Wallem and JoAnn Yeoman.

Each concert has featured an actor who originated a role in a Sondheim musical. Previous guests included Sarah Rice (Johanna in Sweeney Todd), Danielle Ferland (Louise in Sunday in the Park…, Little Red in Into the Woods), Pamela Myers (Marta in Company) and Annie Golden (Lynette "Squeaky" Fromme in Assassins).

Regular performers for Sondheim Unplugged have included Carey Anderson, Lisa Asher, Christina Bianco, David Brian Colbert, Harris Doran, Natalie Douglas, Michelle Dowdy, Barbara Fasano, Terese Genecco, Eric Michael Gillett, Larry Hamilton, Joe Iconis, David Gurland, Hunter Ryan Herdlicka, Trent Armand Kendall, Audrey Lavine, Lorinda Lisitza, Karen Mack, Rob Maitner, Cindy Marchionda, Liz McCartney, Susie Mosher, Mark Nadler, Karen Oberlin, Miles Phillips, Shaynee Rainbolt, Leenya Rideout, Jana Robbins, Becca Johnson Southworth, Trevor Southworth, Elizabeth Stanley, Katie Thompson, Will Trice, Jonathan Whitton and Lennie Watts.

Sondheim Unplugged, which has played its weekly engagement at the Beechman since July 5, was originally scheduled to conclude July 26. Kurt Peterson (Follies) recently appeared in an Aug. 2 encore concert. There is a $20 cover and a $15 food and beverage minimum. Phone (212) 695-6909 for reservations. The Laurie Beechman Theatre is located within The West Bank Cafe at 407 West 42nd St.