Broadway is preparing for its biggest night on Sunday with the 2015 Tony Awards, U.S. theater’s highest honors, following a record-breaking season with a commercial hit vying with an edgy musical for the top prize. Tony winners Alan Cumming and Kristin Chenoweth, who is also a nominee, will co-host the show that will be broadcast live on CBS television from Radio City Music Hall. The best musical prize has turned into a race with “An American in Paris,” with a score by George and Ira Gershwin, and the lesbian coming-out story “Fun Home” in the lead.