Woman in a green dress with a white top and red-hair singing in a room with a blue roof while band equipment is being prepared .
Chances are about even that a woman sings `` Happy Birthday '' in a room .
It is impossible that a woman sings `` Happy Birthday '' in a room .
Chances are about even that a woman sings `` Happy Birthday '' in a room .
A woman sings `` Happy Birthday '' in a room .