Check out this piece on Molly Lewis, who creates ethereal music with her otherworldly whistling skills, from Atlas Obscura:
Sometimes, when Molly Lewis tries to explain her work as a whistler, she calls herself a human theremin. The tone and sound of whistling, she thinks, are similar to the unearthly vibrations of the early electronic instrument—a sound that people tend to recognize. “But whistling has a human quality, which I think is important,” she says. “It’s a mixture of natural and out of this world.”
Usually, though, she explains herself by whistling. Most people can whistle, but before hearing a serious whistler practice their art, it can be hard to understand that a human whistle, like a human voice, can be a beautiful instrument.