Riddle: Four jolly men sat down to play, And played all night till break of day. They played for cash and not for fun, With a separate score for every one. When it came time to square accounts, they all had made quite fair amounts. Now, not one has lost and all have gained - Tell me now, this can you explain?
Answer: The four jolly men are members of an orchestra hired to play at a dance.
Source: https://www.riddles.com/index.php/1053