Japanese film song (from the 70s?) from shut down juggler of music YT channel

I am searching for that song for over a decade now. There was a YouTube Channel in the past: "Juggler of music". It was the single greatest music channel I have ever heard. He dug deep into sample friendly music. Had classics from the 50s to the 70s. And one japanese song from a 60s or 70s movie. A beautiful balad, that is still in my head to this day. I don't speak japanese so I am just humming it in my head. Does anybody know that youtube channel from back then? It got steady copywright claims I guess it got shut down at some point. He also had a nice album that was called "shrooms on vinyl" if I recall correctly. That channel really sophisticated my taste of music and that one dramatic japanese song with that beautiful voice is on top of that list of my lost music. Kind of like Meiko Kaju, Yoshiko Sai or Carmen Maki. Totally melancholic and Tarantino-esque. Sorry. I got no more clues. Just that voice in my head and the desire to hear that song one more time.