Takeshi Yamamoto is a seemingly omnipresent figure in the Fukuoka music scene, playing in bands like Macmanaman, Kelp, Sea Level and many more. He released his first solo album, Somewhere, last year, which was one of this site’s gorgeous ambient highlights of 2019, and at the start of 2020 he came back with a new collection of spacious soundscapes in collaboration with fellow Fukuoka-based musician Wolf of Acid Mothers Temple. Where Somewhere would occasionally use short tracks to focus in on small sonic details, Upsilon is more concerned with the big picture, divided into three movements — long tracks that give the album a wider, looser, more expansive feel. This perhaps reflects Upsilon’s origin as a live improvisation session, albeit one extensively worked on in the studio subsequently, and it retains the exploratory atmosphere of two musicians working around each other in the moment. Fundamentally an ambient record, Upsilon isn’t afraid of pushing into broad crescendos that seem to fill the sonic spectrum or disorientate with disjointed analogue samples and occasionally harsh psychedelic episodes, just as it is content and confident enough to settle back into its own luscious, gentle mindscapes for long periods. And it’s here perhaps that Upsilon really deviates from pure ambient music: despite its gentle pace, it has progressive rock’s constant need to push forward on a journey, drawing the listener through different sonic territory that toys with their sense of comfort — Upsilon is filled with beauty in which you could easily lose yourself, but it is nonetheless an album that wants your attention.