That's a very interesting question. I also think they'll create unique music. Even though they came from the same DNA and are set up with the exact same surroundings, they're thinking processes are going to be different. What I mean by that is, say some green beans are brought in for them to eat. One might think, "This shit is nasty." while the other might think, "Wow, I love this stuff."
So I think their music would be unique in its own way.
Not just their thinking processes, but their individuality that makes them a human (personality comes into play as well).