The Song of Resonance is a song in Lost Ark that can be played to reveal hidden areas or invisible objects. It is also used for some NPCs to increase a players Rapport Level with them.
How to Unlock Song of Resonance
The Song of Resonance can be purchased from Treasure Hunter Igran on Peyto for 16,500 Pirate Coins.
Peyto is located in the Sea of Gienah. To get there, depart from Port City Changun on the Anikka continent and sail to the West. Alternatively, depart from Wavestrand Port and sail to the North. Or depart from Port Krona on the North Vern continent and sail South East.
On Peyto, go to the main upper deck of the ship and find Treasure Hunter Igran in the East Corner.
Interact with Treasure Hunter Igran and purchase the Song of Resonance for 16,500 Pirate Coins.