The worlds of opera and Broadway will collide in a special concert on Aug. 31, when stars Mandy Patinkin and Nathan Gunn unite for a unique blending of voices, style and music. Reserved seats in the pavillion and lawn seats are available at ravinia.org. Patinkin originated Broadway roles in Evita and Sunday in the Park With George, and starred in two critically acclaimed CBS series, Chicago Hope and Criminal Minds. His many movie performances include roles in Yentl, Dick Tracy and The Princess Bride. Nathan Gunn has made a reputation as one of the most exciting and in-demand baritones of the day. He has appeared in such internationally renowned opera houses as the Metropolitan Opera, Royal Opera House, and Paris Opera and as a concert artist with symphony orchestras around the globe. His solo recordings include Just Before Sunrise and American Anthem.