The Theater Equation

The Theater Equation
Live album by Ayreon
Released	17 June 2016
Recorded	20 September 2015
Genre	Progressive metal, progressive rock
Label	Inside Out Music
Producer	Arjen Anthony Lucassen
Arjen Anthony Lucassen live chronology
Live in the Real World (2006) The Theater Equation (2016) Ayreon Universe – The Best of Ayreon Live (2018)
Arjen Anthony Lucassen chronology
The Diary (2015) The Theater Equation (2016) The Source (2017)
Ayreon chronology
The Theory of Everything (2013) The Theater Equation (2016) The Source (2017)

The Theater Equation is a live album and DVD/Blu-ray by Arjen Anthony Lucassen's progressive rock/metal rock opera project Ayreon. The Theater Equation originally consisted of a four live performances, with cast, choir and small orchestra, of the 2004 album The Human Equation, as an actual rock opera, complete with mise-en-scène. It is the first Ayreon live release, although Ayreon songs had previously been featured on live albums by two of Lucassen's other musical projects (Live on Earth by Star One and Live in the Real World by Stream of Passion), and marks the first time an Ayreon album was performed live in its entirety. The Theater Equation consisted of four shows, all played in Rotterdam between September 18 and 20, 2015, with the last performance being the one recorded for the album.

The project, directed by Lucassen's former manager Yvette Boertje, originally was to consist of three fan-made concerts performed under the title Ayreon's The Human Equation Theater Experience; however, after some of the original cast and musicians showed interest in the project, the organizers decided to make it a greater venture.^[1][2][3] Despite using the Ayreon name on promotional material with the blessing of Lucassen, The Theater Equation shows were not official Ayreon concerts; however, the recording was released as an official Ayreon product. The Ayreon Universe shows, which took place in 2017, were the first official Ayreon concerts.^[4]

Most of the cast of the original album was featured on the tour, including James LaBrie of Dream Theater (Me), Marcela Bovio of Stream of Passion (Wife), former Mostly Autumn member Heather Findlay (Love), Eric Clayton (Reason), and Irene Jansen (Passion).^[5] Despite the announcement that he would not take part of the shows due to his reluctance to play live and that he will only support the project as a support advisor, Lucassen performed the part of the Forever of the Stars; his original, more significant part as Best Friend was performed by Wudstik. Some other regular collaborators of Lucassen joined the project, including drummer Ed Warby, and singer Anneke van Giersbergen who replaced Mikael Åkerfeldt as Fear. It also featured a choir, nicknamed the "Epic Rock Choir", that Lucassen hired during production to perform choirs for the album The Diary by his and van Giersbergen's new project The Gentle Storm.