Waltari is more famous in the rest of Europe than in Finland and the band members have very positive relationships to Czech Republic. They’ve collaborated with Czech punk rock band Wohnout and Kärtsy is a good friend of Lenka Dusilová. The band has collaborated with many other artists. They’ve made albums with Finnish ethno band Angelit, they hosted on Apocalyptica’s album and Tarja Turunen from Nightwish was a part of Yeah! Yeah! Die! Die! live performance.