[As the last lilting notes of his song finish, Brook gently strokes Robin's feline head trying to comfort her as well as himself.]

I think... in the end we'll both be alright Robin. It is all very sad, but to dwell too much on the past will make us unable to move on to the future. So we'll remember the ones we've lost, and keep on going and living for their sake, just like that girl.

[He's fairly certain that it's a fairly obvious moral, but it's just a hard one to accept when you're feeling so down on yourself. He had to get the emotions out of his system somehow, and pouring them into his music was the best way he knew how.]