I had a Big Briar theremin for a while. Neat to play with, but I never could get "good" at it.

This one's interesting (if a little annoying with the extra DJ'ing thrown in):

http://www.youtube.com/watch?v=CvkyjR4yk60

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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)