Horse Call

From Zelda Wiki.org

The Horse Call is a horseshoe-shaped flute acquired by Link in Twilight Princess. It is used to play Epona's Song to summon Epona anywhere in Hyrule Field, similar to the Epona's Song from The Legend of Zelda: Ocarina of Time. It eliminates the need for Link to locate patches of Horseshoe Grass.

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Spoiler warning: If you have not completed the relevant game(s), then the following details could spoil your experience.

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The flute was made by Ilia as a gift to Link for his journey from Ordon Village to Hyrule Castle. Before Link could depart, however, a group of Bulbin raiders appeared and captured Ilia and several of the other Ordon children. Eventually, Ilia was found under the care of Telma in Castle Town, though suffering from memory loss. In a quest to restore her memory, Link recovered the flute from Impaz in the Hidden Village, where Ilia had been held captive. After presenting the flute to Ilia, she regained her lost memories and was finally able to give Link his gift.

Musical Instruments
Recorder  · Flute · Ocarina · Eight Instruments of the Siren · Fairy Ocarina · Ocarina of Time · Pipes of Awakening · Drums of Sleep · Guitar of Waves · Wind Waker · Ocarina of Wind · Horse Call · Howling Stone