Colorado-based Zilla is an instrumental rock group with a heavy emphasis on improvisation featuring Michael Travis of the String Cheese Incident (drums, percussion, keyboards, mallet Kat); Jamie Janover (hammered dulcimer, mini-kit, percussion, sampler, electric kalimba, sitar), who formerly played with Travis in the band Zuvuya; and Aaron Holstein (guitar, bass, sampler, keyboards), former guitarist with Boogie Shoes and Vibe Squad. (When it was founded, the band also included keyboardist Steve Vidaic, whose commitment to Citizen Cope caused him to leave Zilla in May 2005.) I...