Liberman joins the previously announced Pamela Myers, who will head the cast as Minnie Marx.

Part of the York's Musicals in Mufti series, Minnie's Boys will play the Off-Broadway venue May 30-June 1. Stuart Ross directs. Additional casting will be announced at a later date.

Minnie's Boys features music by Larry Grossman, lyrics by Hal Hackady, book by Arthur Marx and Robert Fisher. The musical, according to press notes, is described as such: "The early true-life adventures of the Marx Brothers and their indefatigable mother inspired this heartfelt, tuneful laugh fest. The long-suffering Minnie Marx, has five teenage sons who keep her life in perpetual chaos. Unwilling to settle for a life of poverty, she encourages the boys to follow their dreams of vaudeville stardom, touring with them through good times and bad. Then Adolph, Leonard, Milton, Herbert and Julius develop their stage personas, and become known to the world as Harpo, Chico, Gummo, Zeppo and Groucho."

Minnie's Boys will play five performances: Friday at 8 PM, Saturday at 2:30 and 8 PM, and Sunday at 2:30 and 7:30 PM. Audience discussions will follow the matinees.

Erik Liberman made his Broadway debut in LoveMusik. He has also been seen in An Evening of Kurt Weill at Lincoln Center and Off-Broadway in Calamity of Kat Kat and Willie and Malibu Mines Dollhouse. Liberman's screen credits include "Sneakers" as well as the upcoming "Goyband." Pamela Myers was nominated for a 1971 Tony Award for Best Featured Actress in a Musical for her work as Marta in Sondheim’s Company and was most recently seen on Broadway as Cinderella's stepmother in the Tony-winning revival of Into the Woods. She appeared as Dot in the West Coast premiere of another Sondheim musical, Sunday in the Park with George, as well as in regional productions of Gypsy, Sweeney Todd, Hot N’ Cole and Love and Shrimp. Myers has also guest-starred on numerous television productions including "Sha Na Na," "Alice," "Chips," "Happy Days," "Protocol," "Murder in Texas" and "The Big Show."

The York Theatre Company plays the Theatre at Saint Peter's, which is located at 54th Street, east of Lexington Avenue. For more information or to purchase tickets, priced $35, call (212) 935-5820 or visit www.yorktheatre.org.

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"Mufti" means "in street clothes, without the usual trappings."

The series of semi-staged performances will also include Grind (June 13-15) and Goodtime Charley (June 27-29) as well as a new Larry Grossman revue (July 11-13). The latter will feature songs penned by Grossman for Broadway musicals, television, revues, cabaret acts and a presidential inauguration.