It means that all staves get played at the same time.
English morphological rules detail how words relate to other words. Thus, my best assumption would be because BOLDEST is an adjective whereas BOLDLY is an adverb.
I don't know which autobiographical piece of art you are talking about, but generally an autobiography is about the writer himself.
So, having that in mind, I'd say that this is an autobiographical piece of art because <span>c. It shows the pain and suffering experienced by the artist. </span>
