How is the music used in expressing the inner thoughts of the characters in Act 1?

The characters and situations in this section are portrayed in vivid and at times very broad strokes that manifest both musically and textually. In other words, both words and music vividly evoke their individual states of being - their desperation, their need, their confusion, and the varied, sometimes contradictory, drives that make them do what they do in the way that they do it.