The group was originally formed during the autumn of 1989 under the name PANDEMONIUM. The founders were PAUL (guitar, vocal) and PETER (percussion) who was also called ZUBER. During that time there were no music bands of this nature in Poland and in the West there was only SAMAEL, CELTIC FROST and BATHORY. The lack of such bands was the reason why they gained so many fans. In December of 1990 PANDEMONIUM registered its first material which was recorded in the hall of rehearsals, Reh Tape. It contains four recordings, three of them were original compositions by PANDEMONIUM, and the fourth being a cover of SAMAEL "Into the Pentagram". The material was recorded with the participation of a bassist, SIMON, who later became a regular member of the group. As a trio PANDEMONIUM gave many gigs all over the country, also in Switzerland. There was a great deal of talk and many articles written about the group.

After several concerts PANDEMONIUM became one of the most popular bands in Poland right next to KAT, IMPERATOR and VADER. The end result was a contract with CARNAGE Records. The band's first officially published material was a demo called "Devilri". It was recorded in Olsztyn, during the winter of 1992. The six songs that the album contained took on an almost religious characteristic for many people. The tens of thousands of copies sold made it the best selling demo in the world, which was a great achievement in those days. A huge advertising campaign further aroused people's interest in PANDEMONIUM. After the next round of concerts it was high time they recorded a full-length album. At the time SIMON, the bassist, left the band and the support of their producers CARNAGE came to an end. They signed a new bassist, JACK, was from the Plock group HAZAEL, and BARON Records filled the void that CARNAGE left. Composed in this manner, PANDEMONIUM entered the Warsaw studio IZABELIN and recorded "The Ancient Catatonia". The whole album was published in 1994 and had a premiere in Zabrze at the music festival METALMANIA, where such bands as MORBID ANGEL, SAMAEL and CANNIBAL CORPSE performed. This concert was the culminating point for the whole existence of PANDEMONIUM.

Next albums were published under the names "Pandemonium", "...From Oblivion..." and "GAT ETEMMI" with dark industrial and symphonic sound. Natural evolution following Gat Etemmi brought "The Zonei" album released in November 2004, PAUL and MIKE remain from the old constitution, MARK succeeds to sampler, synth and a second guitar... Pandemonium was on the Tour with Behemoth and Frontside, Mystic Production was the organizer and album producer.

Next album brough new conception following glamorous times of an old school of black/death metal from "Devilri" and a power of "Gat Etemmi". New drummer and bass guitarist (Simon and Michael from NIHILIST, ALIENACJA ) joined the band which played lots of gigs in Polish clubs and took part as the headliner in prestigeous fests like MAAGAL FEST, STRASHYDELKO, STRASHYDLO, BLACKSTOCK , MYSTIC FESTIVAL, SAMAEL POLISH TOUR (WITH SUCH A BANDS LIKE SLAYER ,CELTIC FROST, BEHEMOTH, SAMAEL). All gigs met with a great welcoming from fans as well as new songs that were presented. "Hellspawn" has been recorded in Serakos Studio with Mystic Productions as a producer. The band also made a clip to "Hypnotic Dimesion" which is included into new album. Now, Pandemonium (Paul - voc, guit; Mark - guit, Michael - bass; Simon - drums) is working on a new dark ritual sounding stuff.

Source: http://www.pandemonium.metal.pl/index.php?page=bio