My favorite (love the Sandström arrangement):

http://www.youtube.com/watch?v=MlQ_j6N6tHE

Hands down the loveliest piece of music ever written; gives me chills every time I hear it.

We spent last Christmas in Garmisch, Germany, and while sipping Glühwein at the local Christmas market, I heard the little brass ensemble play the standard version of Es ist ein ros. It was a moment I will NEVER forget -- the perfect Christmas memory.

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)