This musical skill allows you to charm an NPC or creature to peacefully approach you. Use the skill, click on a musical instrument (or the game will remember the last instrument you used), then on the creature or character you wish to entice. Each time you try to use this skill, the game will check against both it and your Musicianship skill.
Gideon's Advice: Discordance reduces monster stats/skills and also gives a bonus chance to Provoke or Pacify extremely hard mobs (5%). This might be a useful choice as the 7th skill on a pure bard but I have not gone this route. It could also be a useful skill for a tamer or archer to weaken monsters significantly. If others can comment, that would be appreciated.