Here ya go Illy. A Way to implement Bard.

First The Weapon Class needs a name. Lets just use "Entertainer." Entertainer uses Entertainment weapons, Tools that are used to entertain people but function to be used in combat. These are Harps, Flutes, Whistles, Cards, Dice, and Animators.

Harps and Flutes are Main Hand, Cards, Dice, Whistles and Animators are Offhand.

Every other Odd Number grants a Song that can be Sung or used with a Harp or Flute. Every other Even number grants a Magic trick that are boosted by using cards and dice. All the numbers between for the standard skill granting levels would give Pet Abilities that are boosted if a Whistle or Animator are equipped. .

Now once the Class is done you can let players unlock jobs to specialize in entertainment. Bard, Singer, Gambler, Corsair, Puppet Master, Beastmaster.

Done. Thats how the Job System synergizes with the Weapon Class Armoury system.