No reason was given for the change. Performances continue to April 6. Cerveris will take the role of thirtysomething Kenneth Talley Jr., the disabled Vietnam vet unable to make progress in his life.

Lanford Wilson's comic drama of '60s radicals reuniting in their Missouri hometown on the Fourth of July in 1977 is directed by Jo Bonney. Performances play the Peter Norton Space on West 42nd Street.

Fifth of July, part of Signature's season of Wilson plays, began previews Jan. 16. The cast includes Jessalyn Gilsig (June), Michael J. X. Gladis (Jed), David Harbour (John), Sarah Lord (Shirley), Ebon Moss Bachrach (Weston), Pamela Payton-Wright (Sally) and Parker Posey (Gwen).

Cerveris played Giorgio in the revival of Stephen Sondheim's Passion for the Sondheim Celebration at the Kennedy Center in DC in 2002. He earned a Tony nomination, Theatre World and Grammy Award (original Cast Album) for his Broadway performance as Tommy in The Who's Tommy. He also starred in Titanic on Broadway.

Signature's Peter Norton space is at 555 W. 42nd Street between Tenth and Eleventh Avenues. Tickets are $60. For additional information, visit www.signaturetheatre.org. For subscription and ticket information, call (212) 244-PLAY (7529).