Skupina založená v r. 1969 v Hannoveru. Řadila se mezi soubory označované nálepkou space rock nebo pomp rock. Hudební vlivy: Pink Floyd, Genesis, Yes apod. Jejich koncerty bývaly doprovázeny efektní světelnou show.
Album Eloy vzniklo ve složení...
Madhouse - isolation
Madhouse - in desolation
A house of silence during the day seems bewitching
How everyone stays away no one dare to go near
Madhouse - night-time nearing
Madhouse - lights appearing
They're turning night into day
Freak musicians, smoke
Drifting slowly away with the music
Maybe all the people on the outside looking in
Don't understand the life that's there inside is not all sin
Musicians make their music, smoke, make love so if that's bad
Who outside could claim that they've got happiness like that
Which one is mad?