'Purple' and 'Orange' are the two words in the English language that have no rhyming partners.

So for this competition, you are required to write a song that includes these two words at regular intervals.

you can submit just lyrics, lyrics with a melody or a complete recorded production. Think about how the votes are going to go.
I was going to say 'No Made up words!' such as: Sturple or Porange.

But, I will leave it to the voters if they want to deduct points for made-up-words, that is their choice.