We have a number of people who can sing across all the shows, who will be making some very exciting appearances in the back half of the year. Executive Producer Greg Berlanti More Quotes by Executive Producer Greg Berlanti More Quotes From Executive Producer Greg Berlanti Yes, there will be a musical crossover, there’s going to be a musical pair of episodes in the back half of the year between ‘ Supergirl ’ and ‘ The Flash. ’. Executive Producer Greg Berlanti entertainment
