if cover bands are simply re-creating someone else’s work, above all else, what must they have to be successful in the twenty-first century?

Perspective is important because it enabled the 3 dimensional world to be translated into the 2d world of the picture plane. this had an immediate impact on the representation of reality in art and design. 

Answer:   a thesis statement is the subject of the whole paragraph and is a generality.
a thesis statement clears everything up. its located at the end of an introductory  paragraph  that  summarizes  the point of the essay in all just one or  two  sentences.