Most music I listen to can be categorized as either trance, EDM, or ambient.
I am not as into artists/bands as I am into specific songs, there are a few exceptional artists that I follow such as crystal castles, deadmau5, grimes, burzum, daft punk, Veela, Reol, and Feint. Of these, I believe their best tracks to be:
Crystal Castles — Deicide. Trance/EDM.
deadmau5 — Ghosts n Stuff. Dubstep.
Grimes — We Appreciate Power. EDM, though she does ambient/trance stuff too.
BURZUM — The Password. Ambient.
DAFT PUNK — Instant Crush. EDM.
Feint & Veela — Time Bomb. EDM/D&B.
Reol — Echo. Electronic.
Anime/Games
Fate
Deep Slumber
Kishi Ou no Hokori
You can win by not losing
Berserk
Cowboy Bebop
The classic. This is a nice top 10:
Blue Gender
Blue Gender has some of the weirdest music out there.
Elder Scrolls
This playlist has most of the good songs. Favorites are Ancient Stones and Aruiel’s Ascension.
Pathologic
Odd. But fits the game well.
Death Note
Death note’s sadder songs are much better than their active and happy ones.
Ghost in the Shell
FMA
Has a lot of very high quality soundtracks. In terms of standalone quality, it’s probably the best.
Starcraft
Prefer terran and protoss OST.
Soul Eater
Their vocal tracks are terrible. But the instrumentals of those songs are really good.
There are two vocal tracks that are good, sung by a European singer (?).
Of the normal songs, only Death City is worth mentioning.
Texhnolyze
Attack on Titan
Not technically part of the OST, but belongs in the group.
Assorted
Nightcore
HIGH ENERGY
Many covers of this opening, but I prefer this one.
(I seriously like this song)