When i am horny, i listen to Type O Negative. Peter Steele's voice just leaves me dripping wet!
When I am having a regular old day, i listen to Nine Inch Nails, Tool/A Perfect Circle, The Cure, Marilyn Manson, and Rammstein.
When it is a "Spazmolytic" day, then it is Skinny Puppy
When it is a dancing day, KMFDM, and the Crystal Method
When it is a Hippie day, The Grateful Dead and Janitor Bob and the Armchair Cowboys.
When it is a cramming for finals day, Mozart.