The Rhyme allowed an element of free speech!
A rhyme associates words with similar sounds using a rhyming couplet or short verse. A rhyme is often short and easy to remember and this was a critical element when many people were unable to read or write and a rhyme was verbally passed from generation to generation - it was also a vital element when commoners wanted to comment on the events of the day! It must be remembered that direct criticism or dissent would often have been punishable by death!