"Utfordring" appears as a very periodic concert series run by Eirik Havnes and Arnfinn Killingtveit. At Utfordring #2 they burned a piano outsied RAKE at Svartlamoen in Trondheim. The piano was rigged with contact microphones as well as a bottle of water containing hydrophones, the audio was then amplified over the speaker system. The audience thusly enjoyed the amplified sound of the piano burning. It took a long time for the microphones themselves to burn completely to destruction, so we could hear the amplified sound of the materials creaking and strings springing and flames roaring up until the piano was totally engulfed by the flames and it became too much. This video depicts the aftermath. See the burning in the previous vid.