You are right ! My memory has failed.
Exactly, i made a confusion between this album and the fabulous 3LP "Yessongs", wich were two pieces of my collection that were very often played on my stereo.
Now, you can write the album title and the "authors"...
Thanks for having noticed my error.
It was a double album,

Merci à Marionjr qui m'a fait prendre conscience de mon erreur (suite à une confusion avec un triple album fabuleux, Yessongs...).

je corrige donc : il s'agit d'un double album, et non d'un triple.

It is exactly that ! Well done !