Sigma: "We thank you Doctor-Donna, friends of Oodkind. And What of you now, will you stay? There is room in the song for you."
Doctor: "Oh I've, I've sort of got a song of my own, thanks."
Sigma: "I think your song must end soon."
Doctor: looking a bit disturbed by this last statement "Meaning?"
Sigma: "Every song must end."
And at this point ladies and gentleman, they played a few bars from "Doomsday." My heart just about leaped out of my chest. Did anyone else notice this?