Instrument

Instruments are a recurring weapon type in the Final Fantasy series. These incorporate Flutes, Harps, and several other musical instruments, such as Lutes or Horns. They are the main weapon of choice of Bards, but are also used by other characters, such as Cait Sith from Final Fantasy VII or Eiko Carol from Final Fantasy IX.

Final Fantasy III
The Bard job can equip Harps. By using the Sing command, it can grant multiple status to the party, as well as healing it or damage the enemy party.

Final Fantasy IV
In Final Fantasy IV, the Bard Edward Chris von Muir can equip Harps to deal damage to the enemies.

Final Fantasy V
The Bard job can equip Harps in Final Fantasy V.

Final Fantasy VII
Cait Sith use Megaphones to give orders to his Mog.

Final Fantasy IX
White Mage Eiko Carol can equip flutes.

Final Fantasy X-2
Yuna, Rikku, and Paine use Microphones as weapons when wearing the Songstress dressphere, However, they can't actually attack with them unless inflicted with the Berserk status.

Final Fantasy XI
Bards can equip String and Wind instruments in Final Fantasy XI.

Final Fantasy Agito XIII
One of character is using a flute as a musical instrumnet and weapon of her choice.

Final Fantasy Tactics
The Bard can equip Harps to use in battle.

Final Fantasy Tactics Advance
The Animist and the Beastmaster can equip instruments to call animals, or to control them.

Final Fantasy Tactics A2: Grimoire of the Rift
Instruments can be equipped by the Beastmaster, Animist, and Bard jobs. They are not particularly powerful.

Final Fantasy Agito XIII
One of the characters is seen wielding a flute as her weapon of choice.

Dissidia Final Fantasy
Instruments appear as a type of weapon, equipped by Firion, Bartz, Kefka and Ultimecia. The weapon type includes Bells, Harps/Lutes and Flutes.