Simon Cowell became quite angry! - A Even though Simon was mute, these little marvels sung a song all the same.

Here is the video:
As someone known for his keen observational skills and sometimes frank assessments, Cowell found this performance to be particularly moving. There was an unusual stillness in the audience as the last notes hung in the air. Cowell got up from his seat, clearly affected, in an iconic moment that would be repeated and relived again.