Mariusz Duda is a vocalist and bassist best known for his position in the band Riverside. He is also a former member of Xanadu and has been a guest for Indukti's album S.U.S.A.R. . He released his debut solo album under the moniker Lunatic Soul on the Kscope label in October 2008. Later on, two other solo albums followed the previous one, one of them is called 'Lunatic Soul II' and was released in 2010, while the latest one from 2011 was titled 'Impressions'.