Alio Die
Aidan Baker
Bass Communion
Biosphere
Kyle Bobby Dunn
Mathias Grassow
Hammock
Thomas Köner
Labradford
Nadja
Eliane Radigue! (extreme machine drone)
Stars of the Lid (overrated, imo)
Klaus Wiese
Windy & Carl
from:
https://en.wikipedia.org/wiki/List_of_drone_artists
Also, check out the Dead Texan (SoTL side) and Christina Vantzou.
Bing Satellites are also very good.
Theres a bunch more...
Good luck!
~MMLL