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Klaus Mertens, bassbaritone :: Schedule  Public site   Operabase Professional  Show instructions  Artist:  Sounds like Klaus Mertens Schedule Repertoire Photos Biography Contact Management contact info  Arien[World]  Ivy Artists[Netherlands]  Weiler Artists Personal/other websites  Send us the link to your website   Information from the opera house    Company debut   Information from the agent/artist    Role debut From  / To Opera  Role  Location  Apr 11   Johannes-Passion Bajo Pamplona(Baluarte) C: Koopman;