seven left-hand works have been commissioned for graffman. in 1993, for example, he performed the world premiere of ned rorem's piano concerto no. 4, written specifically for the left hand, and in 2001 he premiered daron hagen's concerto "seven last words". the american composer william bolcom composed "gaea", a concerto for two pianos left hand for graffman and leon fleisher. it received its first performance in baltimore in april 1996. the concerto is constructed in such a way that it can be performed in one of three ways, with either piano part alone with reduced orchestra, or with both piano parts and the two reduced orchestras combined into a full orchestra.