Oh, that girl out there? That's just Hatsune Miku, flying around like she does anytime an artist feels like drawing her doing so. I'd be flying out there too, but I'm stuck doing boring real world stuff with boring real world physics. Maybe I'll get a paraglider someday.
Indeed, if it's anything like the Vegetable Orchestra, she has to buy fresh leeks the day of a performance. Rotten leeks are probably poorly balanced and harder to spin. Unless those are hologram leeks, because those don't rot.