Since I cannot look at any writeup or post about Kiryu since they may contain spoilers for Yakuza 3, I must go on my own knowledge of the characters. From what I know, Kiryu is an ex-Yakuza who is now runs an orphanage and as far as I know that's how his story ends. With that said, I must go with Bard Bartz since he has real musical experience/training.
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You beat yourself up with your past. Don't blame yourself, blame the world. Blame God. Blame me.