Helmut Waldecker has 3 Opeth concerts.

Opeth is a progressive metal band from Sweden that is influenced by many diverse musical styles ranging from 1970s progressive rock to death metal, Their recent releases have deviated from their traditional death metal-influenced style, with more emphasis on progressive elements. Frontman and vocalist Mikael Åkerfeldt is also noted for utilizing both clean singing and death growls, often in the same song. Due to their unique blend of melodic and progressive elements, Opeth are often classified separately from more typical death metal acts.