They may someday play the world-famous, 10,000-seat National Auditorium in Mexico City, Pop Filter, for now, settled on a performance outside before taking the stage around the corner in the Lunario theater for the Berklee Canta en Espanol concert. Pop Filter is Micky and Philip, from Mexico, and Dahiu, from Uruguay. The trio of Berklee alumni and Berklee Canta finalist play the tune “El Cuervo.”