I've just realised that Susan Boyle could well be a robot! My theory is as follows:

Susan Boyle is sent on Earth by spaceship to lull us int oa false sense of security, then the alien robots programmed her to be able to sing, she sang but too high a pitch and later, her head sploded inside...hopefully the robots are soon going to activate a little red button that turns all the SuBo discs into neck cutting flating killing machines!

Prepare yourselves.