Ayreon is a project by Dutch composer and musician Arjen Anthony Lucassen.

Ayreon's musical style derives mostly from heavy metal and progressive rock, but combines them with genres like folk, classical and electronica to form what some call a completely new style of music. The majority of Ayreon's albums are dubbed "rock operas" due to the fact that the albums contain complex storylines featuring a host of characters, each represented by a unique vocalist.

- The Final Experiment
- Actual Fantasy
- Into the Electric Castle
- The Universal Migrator
- Nice 'n' Greasy
- The Human Equation