Hämmer was a Polish oldschool thrash/heavy metal band founded in 1985. They released four albums(two in polish, two in english) and one split with Destroyer band. Hammer consisted of Robert Köhler (vocal), Jarosław Kopała (vocal, guitar), Andrzej Szenajch (vocal, guitar), Jacek Osuch (bass) and Tomasz Klimczak (vocal, drums). Hammer stopped playing in 1993 and started with new staff in 2002. Read more on Last.fm