In early 1999, Meshuggah joined Slayer on their U.S. tour. After the new album and the live performances, Meshuggah was beginning to be recognized by mainstream music, guitar, drum and metal magazines. In mid-1999, Meshuggah performed in several Swedish concerts. The band started to write some new material but reported in mid-2000 that "songwriting isn't that dramatic, but we're getting there slowly". While fans were waiting for the next album, a collection of demos (from the "Psykisk Testbild" EP), remixes and unreleased songs from the "Chaosphere" sessions were released as the "Rare Trax" album. Hielm left the band in July 2001 for unclear reasons. Meshuggah joined Tool on a lengthy tour, playing for more than 100,000 people total.