"I don't use it myself, but I have a friend who's quite good at it," Jeka says with a shrug.

"We can turn it off if you prefer," she said, gesturing at the wall. The music stopped immediately. "Stacy really likes providing mood music in these stalls. It's probably meant to soothe and relax the mind and make learning easier, so there's no point in it if it's only a distraction."