Inspire Courage - His own allies will be annoyed at him, distracting them from fighting or whatever so their hits aren't as strong as they should be.

Aggro - People just ignore him or pay him very little mind because his singing is just that annoying. His allies also suffer from the same flaws from Inspired Courage.

Raging Song - Everyone gets angry at him and will attack Orchid with great fury.

Scare Chord - Now his own allies might be scared as his voice reaches into the depth of their minds and pulls out their worse nightmares. Also some monsters might thing he's serenading them. 

Song of Freedom - This just makes things worse.