Both Till Lindemann and Mikael Stanne have been vocalist in bands, who has been vocalist in more bands?
Till Lindemann: Till Lindemann (] ; born 4 January 1963) is a German singer, songwriter, musician, actor, poet, and pyrotechnician. Till Lindemann:  He is best known as the lead vocalist and frontman of the German Neue Deutsche Härte band Rammstein. Mikael Stanne: Bengt Mikael Stanne (born 20 May 1974) is the vocalist & one of the lyricists (also previously rhythm guitarist) for the Swedish melodic death metal band, Dark Tranquillity and the ex-vocalist for Swedish power metal band HammerFall.
Mikael Stanne