This source was recorded in 1994. (Captured from cassette tape.)
As the experiment, I split to 4 stems (vocals / drums / bass / other separation) with using Spleeter, and then re-mixed them. What I did is replacing drums and bass tracks with MIDI instruments.
See about Spleeter: https://github.com/deezer/spleeter

The original mix can be found at the following URL: (only Japanese)
https://win.way-nifty.com/slot/2020/03/post-9f4433.html
（元音源と説明は上記ブログをご覧ください）

(if) [Remix after separation by Spleeter]

Bedtime Noise