Tonight at 7:30 at the Ohio Theatre, the Cleveland Opera stages the original opera version of Porgy and Bess, the George Gershwin musical known for songs such as "Summertime," "A Woman Is a Sometime Thing," "My Man's Gone Now" and "I Got Plenty of O' Nuttin'." The opera comes complete with a full orchestra under the baton of Grzegorz Nowak, music director of the Grand Opera in Warsaw (Teatr Wielki) and permanent associate conductor of the Royal Philharmonic Orchestra in London. Tickets start at $25. (Niesel)