Gustav Maria Leonhardt (30 May 1928 – 16 January 2012) was a Dutch keyboardist, conductor, musicologist, teacher and editor. He was a leading figure in the historically informed performance movement to perform music on period instruments.

Leonhardt professionally played many instruments, including the harpsichord, pipe organ, claviorganum (a combination of harpsichord and organ), clavichord, fortepiano and piano. He also conducted orchestras and choruses.

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