The Human Equation is the sixth album from the progressive rock project Ayreon by Dutch musician Arjen Anthony Lucassen, released on 25 May 2004 via Inside Out Music. As with other Ayreon albums, it features guest appearances from several musicians previously unrelated to the project, including James LaBrie of Dream Theater, Mikael Åkerfeldt of Opeth, Eric Clayton of Saviour Machine, and Devin Townsend, performing music arranged and written by Lucassen. As with nearly every Ayreon album, it is a concept album with each character being portrayed by one singer. However unlike previous albums, The Human Equation is not a sci-fi story but takes place almost entirely in the mind of a character called Me who is in a coma after a car crash, with each song consisting of one day spent in coma. While his Wife and Best Friend are at his side in the real world, Me, trapped in his own mind, encounters representations of his own feelings and recalls his life from his childhood to his crash. The album was released in three different editions: a regular edition with two CDs, a Special Edition with two CDs and a DVD, and a Limited Deluxe Edition with two CDs, a DVD and a 36-page booklet. From Wikipedia (https://en.wikipedia.org/wiki/The_Hum...) under Creative Commons Attribution CC-BY-SA 3.0 (https://creativecommons.org/licenses/...)