There are so many but probably my favourites are Theme From Shane, Cosy and Mustang. In 1977 I bought my first Burns Marvin (actually it was a Baldwin with the smooth scroll) and I remember that when the then owner handed it to me to try I played Flyder and the Spy. To this day that is the first tune I ever play on any new Marvin I get my hands on, usually followed by Chu Chi.
Brian