While Denver has its share of stellar jazz acts, there aren’t too many that concentrate strictly on free improvisation, which essentially means composing on the fly. This double bill offers a glimpse into two groups that excel in creating compositions spontaneously in a live setting. For nearly a decade, saxophonist Paul Riola has headed up the Bottesini Project, a free-improv ensemble that included a rotating cast of some of Denver’s best jazz players as well as nationally known talent like guitarists Nels Cline and Jeff Parker and drummer Scott Amendola. These days, the forward-thinking group includes Riola, trumpeter Glen Whitehead, saxophonist Lynn Baker, bassist Markus Hunt and drummer Jay Ellis. The Noise Gallery, which highlights jazz, classical and electronic musicians, also creates compositions with Soundpainting, a universal, multi-disciplinary live sign language for composing that comprises more than 1,200 gestures.