Four albums in, the Fire! Trio's once 28-piece collective iteration is streamlined by half and harbours a string quartet. The free assault of Mats Gustafsson's sax now sparingly erupts amid scale and space, often tethered by falling, looping chords: the slow-motion, sensual waves of keys and bass which mark the opening ‘(I Am A) Horizon’, for instance, which conjure middle-aged Robert Mitchum contemplating existence on the Trans-Europe Express in a 1970s noir, to minimalist, world-weary Swedish funk. The addition of strings gives the ennui grandeur. Ruminative scrapes of bass and cello and celestially pure keys and voice cover American primitive guitarist Robbie Basho's ‘Blue Crystal Fire’, while Chic's ‘At Last I Am Free’ sees Susana Santos Silva's trumpet entwine with vocals in Nordic gospel epiphanies. Mariam Wallentin's lyrics contemplate nature and liberty, and this is open-air music, colourful and sharply detailed, like the crisp light and breaths of an autumn mountain morning. Even when the near-16-minute ‘Silver Trees’ ends in a stampede of multi-instrumental monkey-shrieks, and the strings fade fast and jittery, bass and baritone sax maintain underlying order. The steady structure of these long pieces, even when they toy with cacophony, doesn't slacken. This music rarely topples into transcendence either, staying sane in its furthest corners: unfolding, not exploding. The core Fire! Trio's successful, shifting idea of an orchestra, existing on the cusp of jazz, classical, rock and folk forms, works with deceptive ease.