Quatuor Bozzini’s set of Michael Oesterle’s Quatuors opens with a nice comfy chorale that almost immediately drops away to a near-inaudible skein of harmonics. This piece, Oesterle’s String Quartet No. 4, is the latest and longest of the four pieces heard here (but not the entirety of his output for string quartet). The piece moves casually back and forth between slow pulses of alternating chords and scurrying patterns of harmonics, before returning to chorales and whispers. Oesterle gives no programme other than to assert that his musical materials are always “geometric, expressive, and puritanical”. It is the most subtly disorienting piece in the collection, as each passage yields to the next without any formal structural division, while beguiling sounds are tempered by a secretiveness as to where, if anywhere, the music may be directed. Quatuor Bozzini’s style of playing ideally evokes that shrouded expressivity, never loud but each phrase always indelible, however softly it is played.
The remaining three pieces are more easily apprehended, each falling into neatly digestible sections. String Quartet No. 3 “Alan Turing” from 2010 explores patterns, gestures and textures with an appropriate sense of wonder and discovery mingled with loss and regret. The Bozzinis bring out the gentle playfulness of each movement, slightly darkened by the melancholy of its subject. The harmonic language and gestures at times recall the freshness of a previous generation’s “post-minimal” tonality in its first flowering, before it was worked in harness to the service of Hollywood soundtracks. The titles of 2016’s Three Pieces for String Quartet evoke various animals but Oesterle’s notes again cite geometrical puzzles as each piece’s prime mover, claiming inspiration from Stravinsky and Cage. I can hear a kinship with Ruth Crawford in here, which is the highest of praise. The earliest piece here, Daydream Mechanics from 2001, is the most extended and hushed movement in the collection, with genuine whispering, searching out unexpected consequences from an otherwise confined grid of chordal patterns. Quatuor Bozzini’s championing of this composer, matching his language with a refinement of style that moves from rapid filigree to near-stillness in the same mode of emotion, reveals depths slowly swirling below the undemanding surface.