Marino says that the music in Chains of Olympus is "a bit lighter" than the previous games. The reason for this is that there's a certain character in the game that isn't as grim as the usual cast of war-hardened soldiers, and the apathetic Pantheon. Despite only composing fifteen minutes worth of new material, the game's sound should have enough freshness to it. This has to do largely in part by a huge effort to remix old tracks; they take the old tracks apart, restructure them, and then use the various arrangements in a way that ensures each scene has its own unique sound. He also calls the music on Chains of Olympus "more intimate" than what we've seen previously.
Marino also revealed some interesting trivia about the God of War series. For example, did you know that Kratos was originally supposed to be named Dominus? Now how about the future you ask? Marino shared that he will be indeed working on God of War III for the PS3. Another epic game, another rocking music score. There are a lot of other alluring tidbits in the interview, so why not have a read of it for yourself?