The moral of the story...

A couple go to a bar during karaoke night, and they hear a man sing to most beautiful cover of Stairway to Heaven they had ever heard. Since they were planning their wedding at this time, they approach the man after his performance.

"Wow, that was an amazing cover! Would you like to come perform at the reception of our wedding?" they ask him.

"I would love to! As a matter of fact, I'm a justice too, so I could even wed you two in the same day!" he replied.

So it was settled, and the man showed up to their wedding, and he performed a beautiful ceremony. 

Everything was going just perfect ... until the reception. Every song the man sang was absolutely horrendous; he was off-key in every verse, and at some points even forgot the lyrics.

So the moral of the story is: 

Never book a judge by his cover.