Proving once again that some of his most beautiful pieces come when he is paying tribute to someone, Redbird, a tribute to the artist Agnes Martin, is a work of ambient and minimalist grace. The album consists of two pieces: a shorter percussive piece called "Dark River," and a 41-minute work for harp, viola, cello and percussion called "Redbird." Each conveys a hypnotic quality that does justice to its subject. Martin is an incredibly spiritual artist, whose minimal gestures on canvas and paper exude auras of calm. "Redbird" captures that sense in music and, in its continuity, becomes one of Zorn's most effective tributes. As always, Zorn has managed to collect a group of extremely talented musicians, and their execution of this album makes it even more perfect.