"Zor and Zam"

Last night, I figured out the trombone part in a section of "Zor and Zam" (from ~0:51 to ~1:10).  In a loose way, it doubles the vocal melody, and it led me to a few realizations about the lines "The king of Zor, he called for a war / And the king of Zam, he answered" (the first two lines of the song), which are sung to a melody something like this:

Lyrically, the lines exhibit structural parallelism, and the similar melodic shapes add an-other layer to it.  Furthermore, this parallelism (in the lyrics and the music) matches the reciprocal nature of "he answered."