Composer, saxophonist and flutist Henry Threadgill presents 2 full-length works for his 15 piece band "14 or 15 Kestra: Agg", as he explores new ways of integrating composition with group improvisation, here using an entirely new system of improvisation based on preconceived series of intervals realized in multi-layered counterpoint, rigorous polyphony, and timbral contrasts.