If you read the first half of the sub-question (the entire realm), I would be inclined to suggest that you try the classics, pioneers. (I won’t go back as far as Pierre Schaeffer or Daphne Oram).
- Tangerine Dream / Klaus Schulze
- Kraftwerk – All they have ever done, my personal favorite being Electric Cafe
- Jean-Michel Jarre, Oxygene & Equinoxe
- Walter (before becoming Wendy) Carlos – Switched to Bach… the first “popular electronic music” album
- Vangelis – Pretty much everything… the soundtrack to Blade Runner’s is amazing
Their discography is largely pre-MIDI and sampling.
Your second question suggests that you don’t want to be restricted by the entire realm. Sorry, but my knowledge of Trap, D&B, and prog-house is very limited.
You can also check out some late 20th century stuff like Aphex Twin, Susumu Hirasawa and the Art of Noise if you want to learn more.