CHICAGO — Tony Award-winning performer, actress, singer-songwriter, and philanthropist Idina Menzel and her sister, author and educator Cara Mentzel, have been named honorary chairs of Library Card Sign-Up Month. This September, Idina and Cara will join the American Library Association (ALA) and libraries nationwide to sing the praises of a library card. Also in September, the sisters’ debut picture book, Loud Mouse, about a little mouse named Dee who loves to sing very loudly, will be released by Disney Hyperion.