The Obsession Song is like a love song written by a Stalker with a Crush or a Yandere. Most examples simply involve obsessive love with heavy overtones of stalking and possessiveness, but some take it to such extreme lengths that it sounds like the singer is planning on raping you, killing you, and keeping your corpse under their bed. The Obsession Song falls into two basic varieties, although many have elements of both: Particularly pathetic Unrequited Love songs often fall into the passive category, while the aggressive variety sometimes overlaps with the Murder Ballad or Villain Love Song.