A man is singing into a microphone while standing on a stage with instruments and musical equipment on the floor around him .
It is improbable that a man is performing in front of a crowd of 20 , 000 .
It is improbable that a man is performing in front of a crowd of 20 , 000 .
It is highly likely that a man is performing in front of a crowd of 20 , 000 .
A man is performing in front of a crowd of 20 , 000 .