son et lumière, English sound-and-light show, nighttime entertainment conceived by Paul Robert-Houdin, curator of the Château de Chambord on the Cosson River, France, where the first one was presented in 1952. Multicoloured lights of changing intensity are directed against the facade of a historic building or ruin. The changes of light are synchronized with a sound track (relayed through loudspeakers) carrying music and the dramatized story of the site. Usually, no live participants appear. Live effects such as smoke bombs or fireworks are occasionally used. https://www.britannica.com/art/son-et-lumiere Britanica
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