No matter how much you rehearse on that stage once you add 30 000 screaming people with flashing cameras into the equation it's pretty intense.
Stefani Joanne Angelina Germanotta (born March 28, 1986), known professionally as Lady Gaga, is an American singer, songwriter, and actress. At the beginning of her career, Gaga became known for her unconventionality and provocative work. A popular contemporary singer, she is noted for experimenting with new musical ideas and images.
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