Jonas Petter Renkse (May 19, 1975 - ) is a founding member and the lead singer of the band Katatonia. In addition, he played the drums for the band from its founding in 1991 through the band's 1998 album Discouraged Ones. Early in his career with the band, he used the names Lord Seth and Lord J. Renkse. Renkse was also a member of the band October Tide, releasing albums in 1997 and 1999, and is also currently the bassist for Bloodbath.

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