Chris you are right. That's how I determined which songs could be arranged with a likeness or close to the melody.

However, since it was difficult to find songs of this type manually I had to write a computer program that would give these types of relationships and patterns between melody and chords. I had to select from the computer output those that would work and those that were not acceptable.

Another example: https://www.youtube.com/watch?v=Qs_fl2LkFOU

Some of my customers prefer this type of arrangement. Those that are close are have a likeness of the melody.