Manic Depressive Psychosis, MDP, were formed in 1990 at the Yerevan State University. They soon collected ten compositions for a debut album " Usurper of the Sun Rays" self-released in 1993. The album instantly won popularity and the band received a cult status in Yerevan.
The songwriting nucleus of Ed and Henry pursued music experimentation, quite heavy and psychedelic. MDP works embodied ethnic elements and harmonies, were very close to sympho-rock, boasted passion, intuition and inspiration.

In spring 1994 two legionaries from a heavy-metal combo “Soma” joined the MDP that enhanced their existence. They recorded their hit-single “the River” - kind of a prog-suite that became a trump and is mentioned in all anthologies of Armenian rock respectively.

Called a "soul scalpel", MDP decided to go beyond Armenia to find their market in Russia. The result was in releasing a controversial and sophisticated, but obviously avant-garde metal album “Take your Nibbled Apple Back