Adventurers' Guide Apprentice:
Buffs help to ease the impact if you're hit while making your own attacks more effective. The following buffs can be used by all classes.
Horn Melody/Drum Melody/Pipe Organ Melody
Guitar Melody/Harp Melody/Lute Melody
Prevailing Sonata/Daring Sonata/Refreshing Sonata.
Now, this will be important here on out. There are special buffs for each class that are not shared.