Question: Who sang what a lucky man he was?
Disambiguated questions and answers: question: Who sang the original version of Lucky Man?
Who sang the 2007 version of Lucky Man?
Who sang the 2013 version of Lucky Man?
Who sang the 2014 version of Lucky Man?
answer: Emerson, Lake & Palmer
Shaw Blades
Greg Lake
Asia featuring John Payne
Natural Questions answer: Greg Lake (from the Wikipedia article "Lucky Man (Emerson, Lake & Palmer song)")