Drug Music is hard to define,
it is music that one learns to truly appreciate after the consumption of drugs--
This is not necessarily music that one listens to on drugs, but rather it represents the illogical, aimless, and chaotic condition of one's mind post-drug consumption.
Drug Music is often associated with electronic music--
heavy basslines, beeps, clicks, creeping acid synths, and other sounds that stimulate one's brain, flicking the g-spot of one's mental pleasure center. Drug Music, or DM is often devoid of logical lyrics (IE no ballads or love stories), instead there are often repeated words or phrases. A person who likes Vampire Weekend for example, would not understand the concept of Drug Music, and instead find it confusing and threatening.
Mind Dimension 2, and Positif by Tiga and Mr. Oizo respectively, are two classic examples of what defines drug music.
"MIND DIMENSION MIND DIMENSION MIND DIMENSION MIND DIMENSION~ every time I look into your eyes I see the future.. BLURRR BLURRRR BLURRRR BLURRRR"
-I'M LOOSING MY FUCKING MIND RIGHT NOW!!!!
(that's some damn good drug music)