You don’t have to depend on us. Go to the Octave Records page from the PSA home page. Click on any album that piques your interest. Scoll down far enough and you’ll find you can sample the offering on-line. Have fun exploring. Oh, and welcome! Wonder if moderator Sir Elk keeps a list of countries the community represents. It’s gotta be long. Add Estonia.
Here are my suggestions for the categories you provided:
instrumental acoustic or electronic with minimum amount of instruments/sounds playing at once
Don Grunion - Out of Thin Air
Zuill Bailey - Bach Cello Suites
ambient soundscapes (perhaps created by analogue synthesizers)
We don’t have much of this yet, the only one I can think of is on Art of HiFi: Bass, Take What You Need played by Kimberly and DJ Sparr
guitar solos like these from the 80s
Augustus - Ragtime World