Nico Vanhee, a spokesperson for the zoo, told BuzzFeed News that a handful of artists came to see how different animals would react to music. "We were amazed at how the elephants were swinging their trunks in time with the music", he said.
The violinists seen in the video are Jean-François Chamberlan and Anne Pingen, who Vanhee said are "very well-known members of Belgium's Royal Chamber Orchestra."
But not all of the animals were quite so impressed. “The lions didn’t appreciate it,” Vanhee said, and “one monkey climbed on the instruments to stop the musician playing”.
Elephants are highly intelligent animals, so Vanhee says that the zoo "expected some response, but not one this great."