Duos and Trios by vibraphonist Sergio Armaroli, trombonist Giancarlo Schiaffini and soprano and sopranino saxophonist Harri Sjöström is a free-ranging set of improvised music for small groups made in Biella in Italy at the invitation of Armaroli. A frequent musical partner of Schiaffini’s, Armaroli called Sjöström in from Berlin to join him and Schiaffini; these three trios and nine duos were the result. The duos are framed by the trios, which make up the opening track as well as the final two tracks. It’s the duos that provide the album’s backbone and aesthetic as well as literal center. Armaroli and Sjöström may have been new to each other, but their chemistry is unmistakably good and consequently their interplay is assured and coherent. Armaroli is quick to respond to Sjöström’s fleet, fragmentary lines with single-note runs in parallel rhythms, or to set out a foundation of restlessly moving chords. When Schiaffini joins them, the addition of his voice rounds out the collective sound with a robust presence in the lower register and a layer of contrapuntal complexity. Like Sjöström, Schiaffini makes liberal use of extended techniques; his brassy timbres complement Sjöström’s own sharp-edged tone in an unexpected family resemblance.