The criteria was basically what I thought would sound good on the given drug. And yeah - I meant DMT, and the song I picked was kind of a joke based on the rumor that the user often sees a vision of a gnome-like creature. I don't think I'd wanna listen to Bowie's song on any drug.
I understand that certain groups have their chosen drugs (DJ Screw's codeine laced "purple drank" and Sleep clearly weed, but I see them as equal opportunity). Thanks for listening.