Filmmaker Arlen Parsa always knew his great grandfather was a composer, but he’d never heard his music. Then, after digging around an aunt’s basement, he discovered the work of Eustacia Rosales. One particular piece caught his attention: a Spanish opera. Parsa examined the crumbling sheet music and knew he had to get it to the stage before the music of what is to believed to be Chicago’s first Hispanic music writer was lost forever. That’s happening Friday with a one-night only performance of “Andina.” Parsa’s been filming the process of first discovering the music to Friday’s performance for a documentary that he plans to release next year. Arlen Parsa joins us with more on his discovery. (Photo courtesy of Arlen Parsa)