グスタフ・レオンハルト
Barthold Kuijken (; born 8 March 1949, Dilbeek) is a Belgian flautist and recorder player, known for playing baroque music on historical instruments and particularly known for pioneering this manner of performance with his brothers, cellist and viol player Wieland Kuijken and violinist Sigiswald Kuijken, and the harpsichordist Gustav Leonhardt.