The pair have had three stints with the veteran outfit. Frank first joined the ranks for a year in 1982, while Schwarzmann debuted in 1992. Both came back in 2005 for a brief reunion with original frontman Udo Dirkschneider, then returned in 2009 when Mark Tornillo took the mic.

Accept say in a statement: "We'd like to thank Herman and Stefan for being with us these last four-plus years, making themselves available whenever needed and rocking their asses off.