A guy walks into a pet store wanting a parrot.

The store clerk shows him two beautiful ones, one for $5,000 and one for $10,000.

"What does the $5,000 one do?" Asked the customer.

"This parrot can sing every aria Mozart ever wrote," says the clerk.

"What does the $10,000 one do?" asked the customer.

"This one can sing Wagner's entire Ring Cycle. There's another one in the back room for $30,000."

"What does that one do?"

"Nothing that I can tell, but the other two parrots call him 'Maestro'."