son et lumière
Concise Oxford English Dictionary © 2008 Oxford University Press:
son et lumière /ˌsɒn eɪ ˈluːmjɛː/
▶noun an entertainment held by night at a historic monument or building, telling its history by the use of lighting effects and recorded sound.
– origin Fr., lit. ‘sound and light’.
'son et lumière' also found in these Oxford entries:

