Eight Instruments of the Sirens
The Instruments of the Sirens consist of eight different instruments that can be used to awaken the Wind Fish. Each instrument is found at the end of a dungeon and guarded by a Nightmare. Once they are all gathered, Link can bring them to Mt. Tamaranch and play the Ballad of the Wind Fish on them, which will open a path inside the Wind Fish's Egg. He plays along on his ocarina. Inside the Egg, Link can fight the final Nightmare and awaken the Wind Fish so he can leave Koholint Island.
Full Moon Cello
Sea Lily's Bell
The Angler Fish of Angler's Tunnel guards the Surf Harp. Once Link kills the that Nightmare, he can climb up the ladder and back into the main part of the dungeon to find a new door open. The room holds the Surf Harp.
Organ of Evening Calm
The Organ of Evening Calm can be obtained after beating the Evil Eagle in Eagle's Tower. Once the Nightmare is defeated, Link must climb back down the tower and jump off a ledge to the right, where the door leading into the Organ's room will be opened.
The final Instrument is located in Turtle Rock. Like the previous Instruments, Link must first defeat the dungeon's Nightmare, Hot Head, and then enter the newly opened passageway. Here, he can find the Thunder Drum. Link can then head to Mt. Tamaranch to awaken the Wind Fish.