Drone is background music or white noise when reading or writing for me. I turn it on and zone out on what I do but also have an open careful ear for the music as well. Many bands such as Bohren & der club of Gore, Grouper, and Raime help me focus in on what I need to accomplish usually at night but now I have found a new addition to my nocturnal activities.
The Haxan Cloak makes dark ambient/ doom drone music that is very quiet and sometimes barely audible but is quite engaging. The music seems to leap out at you when you least expect it especially when you are barely listening to it. Check out the song above from The Haxan Cloak.