Q:Who is the fat lady?
Q:Why is it not over until she sings?
A: Kate Smith, a large lady, used to sing the 'Star Spangled Banner' at the end of American football matches in the 1950s. Thus one knew the game was over when she sang.
A:The phrase "It's not over until the fat lady sings" is actually a mis-quote. The correct phrase is "It's not over until the fat lady sinks" and has its origins in the game of billiards. The black eight ball was commonly referred to as the "fat lady" so no matter how bad the game was for a competitor it wasn't over until the "fat lady" sank.!!