please xan you explain a question about this paragraph. So it says : select the sentence that distinguishes two ways of integrating rock and classical music.
Answer : it's the last sentence
but I don't understand why it only says that it's for listeners steeped in rock rather than classics .

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It's about marketing. The music is targeted towards people who like Rock. In order to really appreciate the differences between Glass's work and regular classical music, you would need to know Rock music.

Someone coming from the classics might recognize that is sounds different and they might even like it, but to them it's just a difference.
Someone with a love of rock will recognize the parts of Glass's work that comes from Rock, and they will appreciate hearing these elements in this new setting. It's almost like an inside joke... it has more impact to the rock crowd because they know where it is coming from.