A filtered and distorted synth guitar loop in D minor over a D drone, with delay.
Smooth hollow Multi tonal tone ascending
Intense, constant ringing drone
Glassy nightmare drone with vocal accents
Drone - plucked guitar string, hi-pitched oscillating mosquito whine with swelling, multi-timbral string ...
Deep purring rumbling monster drone
Melodic chord swells, filtered
Low, rumbling feedback drone