Let's face it: Christmas can get on your nerves, especially when it's the same procedure year after year. At such a time, even jazz can get on your nerves: shoddy arrangements, monotonous improvisations, and the same timeworn classics you've listened to a thousand times before. What can be done? That's an easy one: you listen to the new Christmas CD by the Opera Swing Jazz Quartet. This is old fashioned, highly refined jazz for connoisseurs played so convincingly that even people who usually abhor this kind of music will just love it.