Discuss the rise of interest in musical expression and representation. when, roughly, did such issues enter musical thinking for the first time?

Answer and Explanation:

The ascent of enthusiasm of melodic articulation came to be during the renaissance era when music there was a resurrection of humanistic culture.

Music before didn't really pass on articulation or feeling since it was regulated generally by the Church.  

A melodic piece from the renaissance era that embodies melodic portrayal is Josquin's Pange Lingua mass, Kyrie. The melodic sounds portrays the singing.