Nhắc đến Ayreon không thể không nhắc đến album The Human Equation, đây là album được tạp chí metalstorm bầu chọn là 1 trong 10 album hay nhất trong 10 năm qua, và là album được cho điểm cao nhất trong các album của Ayreon
The Human Equation (2004)
Track list
Disc I
01. Day One: Vigil02. Day Two: Isolation
03. Day Three: Pain
04. Day Four: Mystery
05. Day Five: Voices
06. Day Six: Childhood
07. Day Seven: Hope
08. Day Eight: School
09. Day Nine: Playground
10. Day Ten: Memories
11. Day Eleven: Love
Disc II
01. Day Twelve: Trauma02. Day Thirteen: Sign
03. Day Fourteen: Pride
04. Day Fifteen: Betrayal
05. Day Sixteen: Loser
06. Day Seventeen: Accident?
07. Day Eighteen: Realization
08. Day Nineteen: Disclosure
09. Day Twenty: Confrontation
Download
Line-Up:
Musicians:
- Arjen Lucassen...............electric and acoustic guitars, bass guitar, analogue synthesizers, Hammond, Mellotron, additional keyboardsVocalists:
- Devon Graves (Dead Soul Tribe) as 'Agony'- Devin Townsend (SYL) as 'Rage'
- Eric Clayton (Saviour Machine) as 'Reason'
- Mikael Åkerfeldt (Opeth) as 'Fear'
- Magnus Ekwall (The Quill) as 'Pride'
- Heather Findlay (Mostly Autumn) as 'Love'
- Irene Jansen (Karma) as 'Passion'
- James LaBrie (Dream Theater) as 'Me'
- Marcela Bovio (Elfonia) as 'Wife'
- Mike Baker (Shadow Gallery) as 'Father'
- Arjen Lucassen (Ayreon) as 'Best Friend'
Instrumentalists:
- Ken Hensley (Uriah Heep, Various) / Hammond- Oliver Wakeman (Nolan & Wakeman) / keyboards
- Martin Orford (IQ, Jadis) / keyboards
- Ed Warby (Gorefest, Various) / drums
- Joost van den Broek (Ayreon) / keyboards
- John McManus / Low-flute, tin-whistle
- Jeroen Goossens / flute
- Robert Baba / violins
- Marieke van der Heyden / cello