"solo_singer" . "1970-04-24Z"^^ . "American Chicago blues pianist" . . . "Spann, Otis"@en . "Otis Spann (March 21, 1930 \u2013 April 24, 1970) was an American blues musician whom many consider to be the leading postwar Chicago blues pianist."@en . . "Otis Spann"@en . . . "1970Z"^^ . . "1930Z"^^ . . "1930-03-21Z"^^ . "1944Z"^^ . . . . . "1970Z"^^ . .