The UCSD contemporary music/theater group Kallisti is presenting “The Threepenny Opera” in May. Susan Narucki, a music professor at UCSD and Grammy-winning singer, leads the kallisti group and is co-starring in the production directed by (and co-starring) Ruff Yeager. Narucki and her Kallisti Ensemble, which does one experimental opera/musical theater show each year, were in rehearsal on this recent Friday.