Back in November I was introduced to the idea of a jazz quartet being all sax players when I heard (and reviewed) the album The Circumference Of Reason by the ROVA Saxophone Quartet. Which is good because, without it, I might not have been prepared for what faced me when I started listening to (D)IVO (digital), an exceptional (and exceptionally) free jazz album by (DIVO) Saxophone Quartet, a four-piece consisting of tenor saxophonist Ivo Perelman, soprano saxophonist Tony Malaby, alto saxophonist Tim Berne, and baritone saxophonist James Carter.