Which musician, Mikael Åkerfeldt or Dave Pirner, is best known as the lead vocalist and frontman for the alternative rock band Soul Asylum? 
Mikael Åkerfeldt: Lars Mikael Åkerfeldt (born 17 April 1974) is a Swedish musician, prominently known as the lead vocalist, guitarist, and primary songwriter of progressive death metal band Opeth, as well as being the former vocalist of death metal supergroup Bloodbath. Dave Pirner: David Anthony "Dave" Pirner (born April 16, 1964) is an American songwriter, singer, and producer best known as the lead vocalist and frontman for the alternative rock band Soul Asylum.
David Anthony "Dave" Pirner