High Quality Content by WIKIPEDIA articles! Gustav Leonhardt (born 30 May 1928, `s-Graveland, North Holland) is a highly renowned Dutch keyboard player, conductor, musicologist, teacher and editor. Leonhardt has been a leading figure in the movement to perform music on period instruments. He has played professionally the harpsichord, pipe organ, claviorganum (a combination of a harpsichord and an organ), clavichord and fortepiano.