Back in 1995 - Ayreon (SOtD MDCXIV)

Back in 1995, the album Ayreon - The Final Experiment, was released.
It was a Metal Opera written by the Dutch gentle giant, Arjen Anthony Lucassen.
Ayreon ended up becoming the band name for Lucassen's solo project, and The Final Experiment as it's debut album.

Ayreon - Ayreon's Fate

Back in 2004 - Ayreon (SOtD MCCIX)

Back in 2004 Ayreon released The Human Equation.
It's considered, by many, as the best album to date, of the Dutch Progressive Metal band.

Ayreon - Pain

Ayreon - The Theory Of Everything (SOtD CMLIV)

The Dutch giant of the Progressive Metal is back. Ayreon, the band of Arjen Anthony Lucassen and guests, has a new album, The Theory Of Everything, the ninth.
Impressive Keyboard lines throughout the double album. A great album that will definitely gather a great number of fans but also a good number of haters.

Ayreon - The Theory Of Everything