Day Fifteen: Betrayal by AYREON Overview Tag Appears on Human Equation Human Equation [Limited Edition] [Bonus DVD] The Human Equation The Human Equation (CD2) The Human Equation [CD2] The Human Equation, CD2 The Human Equation (Disc 2) The Human Equation [Disc #2] The Human Equation [Disc 2] The Human Equation Disc 2 The Human Equation [Regular Edition] The Theater Equation The Theater Equation - Act 2 Playcount 749 Listeners 150