Apollo Harp

Apollo Harp is a recurring weapon in the series. It is often one of the strongest harps in the games that it appears in, and is often the best weapon for the Bard Job class.

Final Fantasy III
Apollo Harp is the strongest harp in the game, and can only be used by Bards and Onion Knights. It provides 60 Attack and +10 Mind, and inflicts Silence when attacking with it. It is found in Forbidden Land Eureka.

Final Fantasy IV
Apollo's Harp is the weakest of the three Advance exclusive weapons for Edward. It provides 98 Attack, 40 Accuracy, as well as +15 Strength, Spirit, and Agility, and is Fire-elemental. It also inflicts critical damage when used against Dragons, and is only found in the Cave of Trials.

Final Fantasy IV: The After Years
The Apollo's Harp returns in The After Years. It is still inferior to the Loki Harp.

Final Fantasy V
Apollo's Harp is the strongest harp in the game for the Bard class, and is one of the 12 Sealed Weapons. It has an Attack of 42 and Hit rate of 45. For some strange reason, it can do 9,999 damage to Neo Shinryu.

Dissidia Final Fantasy
Apollo's Harp is a level 92 instrument that provides +61 Attack, +2 Defense, and EX Core Absorption +20%.

Etymology
Apollo is a Greek god recognized as, among other things, the god of poetry, music, and the arts.