When Sandy met the Duke: describe a public art collaboration between Alxander Caldwell and Duke Ellington

Washington, DC - Calder at National Gallery of Art
Originally uploaded by Aaron Julius Kim

It is Xmas, 1963. Rockefeller Center is to be the site of a month-long event that brings to the public a cultural gift that combines the talents of sculptor Alexander Calder and musician Duke Ellington.

Describe the event, briefly, emphasizing the achievements and strengths of the 2 artists.