What is used for emphasizing or changing a topic within a sentence?

if you need to emphasize a word or a particular fact in a sentence, you can use italics to stress it. That said, italics and other font changes lose their impact if overused. It is best to use such devices sparingly and rely on strong writing and strategic word placement to get your point across

Explanation:

"the tune the he might never know again." this part build anticipation. dexter got extremely happy by the piano tune. he could see what he was living at that moment in his life throught this feeling. the reader might want to learn more about his happy life. in fact, he called it a state of   'ecstasy'. the fact that he had got in a mood of intense appreciation and that everything about him was extremely bright and glamorous might lead the reader to feel that this state of happiness may not last long. the two parts from the excerpt that exemplify the anticipation are: " the sound of the "; " it was a know again."