Composer and electronica musician Federico Behncke and Santo Y Seņa, a violoncello, percussion and electronic music trio made up of Michael Palzewicz, Jake Phelps and Behncke, will perform music with South American influences and electronic beats at 6:45 p.m. Tuesday, Sept. 4, at the Oregon Shakespeare Festival’s Green Show in the festival’s courtyard, 15 S. Pioneer St. Admission is free.