Directors do that sometimes.
I had a UIL competition yesterday and Varsity girls(My group) got a one on both(one is rating the best) and A-capella got a 3(like right in the middle). My teacher started crying butt I didn't care cause WE GOT A ONE.
I don't know if you would want to or if you would be willing to try but do you think you could write a piano part to it and send me the video, then I would merge it with the song and give your credit for the piano