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In page Toots Thielemans:

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Thielemans was born in Brussels, Belgium, on 29 April 1922.[1] His parents owned a cafe.[2] He began playing music at an early age, using a homemade accordion at age three.[3] During the German occupation of Belgium beginning in 1940, he became attracted to jazz, but was then playing on full-size accordion or a harmonica, which he taught himself to play in his teens.[2][4]