Regardless of your skill levels in the 3 bardic skills you can only use the mastery from one of the 3 at a time. You must do the silly quest each time you want to switch mastery. The quests are very easy, but quite ridiculous that you master the songs and have to re-master them each time you want to use a different set. ie. If you do the mastery quest for the peacemaking songs and decide you want to use the discordance songs which come in the same song book you have to do the discordance quest. So far, so good. But wait, now you can no longer use the peacemaking songs unless you redo that quest at which point you can no longer do the discordance songs, DOH! And a footnote to this: For the provocation quest you must use 5 different rabbits and 5 different healers. This is not explained in the quest.