ECM Special VI continues the journey through this rare 1970s compilation series from the Japanese Trio Records imprint, gathering a deepening philosophy of resonance. Across its seven selections, the instrument becomes a hidden intelligence moving through the floorboards, where melody becomes sediment and rhythm grows roots in the dark.

“Re: Person I Knew” features Ralph Towner on 12-string guitar and piano alongside Glen Moore on bass in a crystalline selection from Trios/Solos. The Bill Evans tune shines in this lively rendition, its familiar contours given a freshly polished interior. Moore moves with a buoyant radiance, carrying joy with a shadow tucked inside it, that secret bruise at the center of lyricism. The combination of instruments and the raw presence of the recording create a classic sound, as though the tune had been waiting inside the grain of the room for someone to touch the right string.

“Conference Of The Birds,” from the Dave Holland classic of the same name, shifts into a more detailed register. The bassing here is central to the tune’s structural integrity, acting as the trunk from which the winds of Anthony Braxton and Sam Rivers take their intricate departures, while Barry Altschul’s marimba knots the wood with character. Its strength lies in subtleties that grow more evident in this surrounding company. The lilting melody and delicate interplay never fracture their sway, even as the piece seems to think in suspended calculations.

“Hotel Hello,” another title track, comes from the duo album by Gary Burton and Steve Swallow. This electric bass-forward tune is richly textured, with Swallow doubling on piano while Burton moves among marimba, vibraphone, and organ. Its playfulness has a dissonant edge, a kind of smiling unease, charming because it refuses to resolve into innocence. The tension builds without surrendering to release, turning the piece into a haunting foray into multitracked nostalgia.

“Mountainscape V” offers a wonderfully synth-infused example of Barre Phillips’s artistry, future-seeking yet unmistakably marked by its era. Although the bass is partially absorbed by the overall assemblage, veneered by John Surman’s soprano saxophone and animated by Stu Martin’s drumming, it remains the primary artery, slightly distorted inside its electronic wrapping. Its distance is answered by the tender intimacies of Arild Andersen’s “Wood Song,” a gorgeous improvisation from Shimri with pianist Lars Jansson, Pål Thowsen on percussion, and Juhani Aaltonen on wooden flute. Here the bass treads a circular path and learns that arrival is only another form of departure. Hints of other horizons lure the soul with delicate promises of return through a door one has never seen before.

Eberhard Weber’s The Following Morning brings us “Moana II,” a swath of atmospheric imaginings with haunting arco calls amid Rainer Brüninghaus’s glass-cold piano. Its changes are elastic, yet its emotional integrity never slackens. Weber’s sound seems comfortable vacillating between body and apparition, making for a luminous contradiction in which weight is transformed into dream-geometry, stepping aside to let some long-lost emotion cut to the front of the line.

The compilation closes with “Trilogy III” from Gary Peacock’s Tales Of Another, an early germination of the Keith Jarrett Trio with Jack DeJohnette. After Peacock’s introspective introduction, the band gathers speed and carries the listener toward a horizon that keeps receding under the force of its own invitation. Jarrett is in fine form, his soloing erudite without becoming ornate, while DeJohnette and Peacock hold the structure with total concentration. Thus, ECM Special VI turns the bass into a metaphysical instrument. Perhaps all listening begins there, in the low frequencies that support language, where the self exists in the state of constant rearrangement.