The pianist is Lise Linde Kronenberg, filmed on her first birthday. It's not clear whether the piano music was overdubbed on a pre-existing melody, or whether the orchestral accompaniment was created specifically to harmonize with her extemporaneous creation, but the result is fascinating. Try playing it for someone who can't see your monitor, and ask them what they think of this "nouveau" piano style.
And it has an LOL ending.
And it has an LOL ending.
I'm sure the parents, or whoever made the video, intended it to be a joke, not to trick people, but the real audio from this would have been painful clashing discords.