Josh Gross, artistic director of Puppeteers for Fears, has written a new horror musical comedy, “Robopocalypse: the Musical! ” which opens Oct. 20 at Pioneer Hall in Ashland. It features live puppets, a live rock band with synthesizer, puppet rap battles, a light show, and multimedia backgrounds. I met Gross at Case Coffee Roasters on Siskiyou Boulevard in Ashland. JG: A core part of our mission has always been to create new art and new pieces that come from a local voice.