Octavia is too cool for this debate. I am not. What is the instrument she plays? I'd thought it was settled when Jayson Thiessen mentioned in his Reddit interview that he thought it was a Cello, but a pony with an absurdly suave voice has gone and made a video using apples, size comparisons and a lot of math to blow the lid right off this mystery. So I'm back to not being sure (and once upon a time, I was sure in the opposite direction).
Video's after the break. What do YOU think?