A posting on the cabaret's official website reads, "Due to an unexpected reaction to medication she’d been taking, Barbara Cook has been forced to postpone her RRazz Room engagement." (Cook was filling in for Elaine Stritch, who had also postponed due to illness.)

Originally scheduled to perform through June 10, Cook will now play the California venue Aug. 21-26.

Barbara Cook, a 2010 Tony nominee for her performance in Sondheim on Sondheim, has starred on Broadway in Flahooley, Candide, The Gay Life, The Music Man and She Loves Me. She received a Best Featured Actress in a Musical Tony Award for her performance in The Music Man, and her one-woman show, Mostly Sondheim, was nominated for a Tony in the Best Special Theatrical Event category. Cook was also seen on the New York stage in Barbara Cook's Broadway. Both Mostly Sondheim and Barbara Cook's Broadway were recorded for DRG. Cook made her solo debut at the Metropolitan Opera, which was also released on DRG Records.

Read more about Barbara Cook's theatrical history at the Playbill Vault.

The RRazz Room is located at 222 Mason Street (at Ellis). For more information visit therrazzroom.com.