An Emperor owned a majestic white stallion, the finest beast in all his Kingdom. One night, a thief tried to slip in and steal the horse, but was captured by the palace guards and thrown into the dungeon.
The next morning, he was dragged before the Emperor's court. "How dare you," bellowed the Emperor, "lay hand on my royal steed! Jailor, put this thief to death!" 
Immediately, the thief bowed deeply. "Your judgement is peerless and wise, O Emperor," he calmly replied, "but my life is of little value. I should offer you a gift before I depart. Your mount is quite a fine one, but if your eminence would spare my life for just a year and a day, I swear to you I can teach that horse to sing.  To the surprise of all, the Emperor quickly accepted the offer.
The jailor whispered to the thief, "You are a fool!" You will be tortured when you fail.
" I am a fool?" Much can happen in a year and a day. The King may die. The horse may die. I may die... and maybe the horse will learn how to sing."