They've also had guest appearances by many notable heavy metal musicians including Michael Weikath, Tobias Sammet, Joacim Cans, and Doro Pesch.
Cans participated with a choir team in the Swedish television program Körslaget (the Swedish version of Clash of the Choirs) in 2008.
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He is the only member aside from founder and guitarist Oscar Dronjak to appear on all of the band's albums.
He also plays drums on Joacim Cans' solo-project album "Beyond The Gates", and with Kevin Moore's band Chroma Key.
He has also done the cover art for Joacim Cans' (Hammerfall singer) solo album, Beyond the Gates (2004).