Dżem is a Polish blues-rock band. Their history dates back to the mid-1970s, although their first records were released in the mid-1980s. Their style varies between blues, southern rock, and hard rock. Their late vocalist - Ryszard Riedel [d. 1994 from heart failure caused by heavy drug addiction] - was an iconic figure in the history of Polish rock, followed by a nationwide cult similar to Jim Morrison's. His replacement - Jacek Dewódzki - sang on three albums in the second half of the 1990s