Ethos is a way an author appeals to the reader/viewer. It is one of the 3 appeals...Ethos, Pathos and Logos
Ethos is based on credibility and building trust...so we are looking for facts or things that would make the author worth listening and a credible source.
Example:
Dentists across the world trust and use this toothpaste.
The fact that we know that dentists are endorsing this product adds to the appeal and credibility...it turn we trust it.
Parables were commonplace in Chaucer's time, and audiences would have found them familiar.
Parables resembled the teachings of Jesus, with which most audiences in Chaucer's time were familiar.
Answer:
In order for Carla Bruni to be able to adapt the poem she needed to consider rhythm and meter as well as the patterns of sound within “Promises like pie-crust". The changes were made to the patterns of stressed and unstressed syllables that were used in the song form.
I think it was a because I ever studied that but I am not sure about the answer