They're talking about the music in the credits. It's Radiohead, not some shitty JPOP.
But yeah, the ending was predictable because they packed so much foreshadowing into the series. If you got the references, you could pretty much see how things were going to unfold. For example, Daedalus is a character from a Greek myth. If you know the myth, then you'd realize that the Re-l clone fit the part of Icarus. Just as in the myth, she flew too close to the sun and died.