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Give 60 Trunks. Give 60 Solid Trunks or Barren Trunks. Give 60 Fine-Grained Trunks. Give 60 Fine-Grained Trunks while at job level 50.
After your job change, the Bard will offer to give you a weapon if you have 60 Trunks. Each type of Trunk gives you a different weapon. For 60 Trunks, you will receive a Violin. Violins have 3 slots and 50 attack power. The element is neutral, and the weapon can be upgraded. Trunks can be obtained from Willow and Elder Willow at Payon Field. For this kind of Trunk, you will receive a Mandolin. Mandolin gives batter attack, which is 90, still with neutral element, and can be upgraded. Compared to Violins, Mandolins only have 2 slots. Solid Trunks and Barren Trunks can be obtained from Willows at Payon Field, but have a lower drop rate compared to Trunk. You get a Lute with two slots for 60 Fine-Grained Trunks. This weapon has a neutral element but has an amazing 105 attack power. But if you have enough Zeny, purchase this weapon from Comodo Weapon Dealer instead for 24,500z. Fine-Grained Trunks can be obtained from Willows as well, but only have 10% chance of drop. If you're an Archer with a job level 50, the Bard will give you a Harp instead of a Lute. Harps also have 2 slots, but compared to Lutes, you can get 114 attack power plus 2 INT. Harps are also neutral in element and can be upgraded, but cannot be purchased from weapon dealers.