<page_title> Petter Karlsson </page_title> <section_title> Discography </section_title> <table> <cell> Therion <col_header> Band </col_header> <col_header> Therion </col_header> <col_header> Therion </col_header> <col_header> Therion </col_header> </cell> <cell> Sitra Ahra <col_header> Album </col_header> <row_header> Therion </row_header> </cell> <cell> Co-writer of "Hellequin", lead vocals in "2012" <col_header> Contribution </col_header> <row_header> Therion </row_header> </cell> <cell> 2010 <col_header> Year </col_header> <row_header> Therion </row_header> </cell> </table>
In 2010, Petter Karlsson co-wrote for Hellequin and did the lead vocals in 2012 on Therion's Sitra Ahra.