ok i can't be bothered doing this because i have better things to do, but that's exactly what we had to do for the unsw music audition, and it was generaly ok unless i tuned out and forgot what the first melody was
but speaking of happy birthday, putting that one high note in the middle was a really dumb idea because it's always ridiculously flat, and everyone sings in different keys anyway, i find it hilarious and can't ever sing the song without laughing my head of at the lack of singing talent in the room