Artist Biography Ym:Stammen was an ethnic-influenced post-punk band from Oslo, Norway that was founded in 1983 by Trygve Mathiesen. They had their first rehearsal in Oslo, August 13, 1983. They labeled their music as Nordic stomp with lyrics influenced by philosophy, religion, and surrealism, put together by Mathiesen. The band toured Northern Europe throughout the 1980s and 1990s and Canada (june 1998). Ym:stammen gave their last performance at Blå in Oslo June, 23. 1999.