Lex van Delden, born Alexander Zwaap, 10 September 1919 - 1 July 1988) was a Dutch composer. Born Alexander Zwaap in Amsterdam (the Netherlands) as the only child of Wolf Zwaap, a school-teacher, and his wife Sara Olivier, Lex van Delden took piano-lessons from an early age - first from Martha Zwaga and later from the celebrated pianist, Cor de Groot. He started composing at the age of eleven, when he set poems by Guido Gezelle to music since a long illness prevented him from playing the piano. He remained self-taught as a composer.

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