I believe there are two versions of the theme song. There is the one they use during the black and white years that sounds very high pitched and whistled at a high tone. Then, there is the lower pitched ending song used throughout the series that was also used in the color opening. Anyone notice the difference in the way it was whistled? Also, during the black and white opening, it had finger snapping, while the later one didn't.

Which one do you like better? I like the earlier one, very old fashioned, because I can do it myself. The other one has instruments.