Ellen Arkbro's fourth album, Nightclouds, collects five improvisations for solo organ, recorded across Central Europe in 2023-24. Nightclouds is more unabashedly Romantic and introspective than her previous efforts, though it remains firmly rooted in the rigor and precision that have come to define Arkbro's concept. Extending her previous explorations of spatialized harmony, tactility, and texture, Arkbro draws equally on sacred music, ECM-style jazz, and downtown minimalism, conjuring a cool intimacy and tone. Her decelerationist chordal improvisations envelop the listener in dirge-like washes, while her close miking reveals the rough haptic grain of the reeds, bringing the listener both inside and outside the sound. Evoking Kjell Johnsen and Jan Garbarek's duets, or La Monte Young and Tony Conrad's take on Euringer and Harmer's cowboy song "Oh Bury Me Not," Nightclouds channels spiritual pathos through a rigorously restrained architecture. Following up on last year's Sounds While Waiting (W.25TH, 2024), a selection of stereo mixes documenting Arkbro's spatial organ installations, Nightclouds shifts direction, focusing on instant composition and improvisation. Elegant, simple chordal scaffolds support rich, ever-shifting textures; listening closely necessitates surrender to sustained irresolution. Bookending a collection of short pieces are two variations on the titular composition, "Nightclouds," which is a sly nod to British jazz guitarist Allan Holdsworth: The first take slows down and stretches out a continuously modulated harmonic progression, while the short closing version simply loops three chords. Situated between these tracks are "Still Life" and "Chordalities," two short works recorded at the Temple de La-Tour-de-Peilz in Vevey, Switzerland. The second half of the album is given to "Morningclouds," a sprawling work recorded in the reconstructed Gedächtniskirche (Kaiser Wilhelm Memorial Church) in Berlin. Arkbro's concise musical vocabulary and formal architecture evoke a sense of emotional ambivalence, simultaneously uplifting and mournful, guiding the listener through a spectrum of feeling with a cool and distant beauty. Nightclouds stands as a profound statement in Arkbro's evolving body of work, at once introspective and expansive, the album reaffirms her singular ability to transform harmonic simplicity into deeply affecting sonic landscapes, inviting listeners into a space of contemplation and emotional depth.