According to Australian news outlet ABC, Matt Waller, a tour operator in Neptune Bay, discovered that great white sharks act more calmly when listening to music by AC/DC, the Aussie heavy-metal band that reached its peak during the 1980s. The two songs favored by the sharks: “You Shook Me All Night Long” and “Back in Black.”

It all started when Waller met up with some divers on Guadeloupe who played music in the water. Certain songs, they told Waller, seem to change the behavior of the sharks. With his company Adventure Bay Charters, Waller began experimenting with underwater speakers attached to diving cages. AC/DC became a smash hit for the sharks down under.

After Waller played the songs using underwater speakers, the sharks became “more investigative, more inquisitive and a lot less aggressive."

“Sharks don't have ears, they don't have long hair, and they don't head bang past the cage doing the air guitar,” Waller told Australian Geographic. So if the great whites aren't necessarily rocking out to AC/DC's greatest hits, what's the appeal? Waller notes that there is a connection between a song and the frequency and vibration in the water that the sharks enjoy.

“They actually came past in a couple of occasions when we had the speaker in the water and rubbed their face along the speaker which was really bizarre,” he said.

Waller is not a shark expert, but this discovery is significant. By using music and not bait to attract sharks during tours, his company is helping cage-diving operations become more eco-conscious and environmentally sustainable.