I'm going to tag along to your post, Mac, as I have been wondering the same. I can see the benefits of keeping the ballads up... but as I've been leveling (level 20 now) I can't help but finish mobs off with the Coda. To me the ballads and anthems just aren't up long enough to justify it. I have to assume when I get higher level or trait legacies once I get to that point they will have a longer buff duration... but as it stands I just use the Coda for the nice burst of DPS.