In addition to her Broadway credits, Horvath sang the leading role of Grizabella in the National Touring Company of Cats. Off-Broadway credits include the Mother in Yoko Ono's New York Rock and Svetlana in the revised version of Chess.
Furthermore, Horvath showcased her talent by starring as Grizabella in the touring production of Cats. Her notable roles also include the Mother in a musical piece by Yoko Ono, titled New York Rock, and Svetlana in a reworked edition of Chess.