What information might the reader have if the above passage were written in the first-person point of view?

I don't see the passage so I can't give a definite answer. However, you would have more insight into a character's thoughts and feelings if it were written in first-person.

themselves

an intensive pronoun is a pronoun that ends in self or selves, such as himself, herself, themselves, yourself, ourselves. since band members is a third person plural, the correct intensive pronoun would be themselves. if the band was talked about as a collective noun, itself would be the appropriate intensive pronoun. intensive pronouns are used to add emphasis to the noun it's modifying which is why it directly follows it.

adverb is the answer i believe.