Sitting down to listen to an album of improvised music is like sitting down to a dinner prepared by guest chefs given artistic license. You never know exactly what you'll get and the surprise element is a significant pleasure factor in the experience.

Putting together three musicians like guitarist Arthur Bull, trombonist Scott Thomson and drummer Roger Turner can yield unpredictable results. Bull and Turner have played together on occasion since 2002, but Thomson is a recent addition to the mix and the end product is a series of fresh and unexpected tracks of creative improvisation of the textural and conceptual kind that evolve organically into coherent and delightful compositions.

"Bookshelves," which opens the set of six tunes on the Musique Actuelle Montreal label Ambiances Magn�tiques, sets the tone for the experience, with its gentle progressing sound drips and bubblings, with a percussive emphasis, threaded by the cooing of Thomson's trombone as he makes judicious use of mutes and provides some varied articulations that are as expressive as they are imaginative.

In contrast to the silk tones of the trombone, Bull's guitar weaves some slinky lines of surprising variety, as in "The Meadows" where he works a nice tremolo effect, along with smooth sliding and thin pizzicato sounds from various manipulations of strings and articulations of the outside-the-box variety.

The set ends with "Murray Street Skins," a piece that alludes to the Montreal Griffintown neighborhood street that was home to local legendary free jazz drummer John Heward who passed away in 2018. Standing, perhaps, as a tribute to his artistry, which is reflected here in the focus on percussive sounds, from guitar and drums, while Thomson improvises a sort of uplifting dirge with smears and gutturals with fetching lyrical elasticity.