Epona's Song

"“Epona’s Song”" is a melody played by Link in various games to call Link's horse, who is usually named Epona by default.

Ocarina of Time
In Ocarina of Time, “Epona’s Song” can be learned from Malon, Epona's owner, in Lon Lon Ranch when Link is a child. Initially, Link can play this on his Ocarina to tame Epona and beck her to come. After the horse is won from Ingo at Lon Lon Ranch, playing the song as an adult allows Link to call Epona and ride her. Whenever this song is played, Epona travels to wherever Link is in Hyrule Field, Lake Hylia, Gerudo Fortress, and some other outdoor areas.

If Link has an empty bottle, “Epona’s Song” can also be played around cows to earn milk.

Malon can be heard singing this song at night at Lon Lon Ranch as an adult, or Hyrule Castle as a child, depending on how far the game has progressed.

Majora's Mask
"Epona's Song" can also be played on Link's ocarina to call Epona in Majora's Mask, but only after Link first finds her in a stall at Romani's Ranch. Once again, it is only effective in areas Epona can reach, such as Termina Field or certain portions of Great Bay Coast. Epona's Song is taught by Romani after Link agrees to help her save the ranch from Them.

Twilight Princess
Although "Epona's Song" appears again in Twilight Princess, it may not be as one would expect. Even though it still calls Link's horse, rather than playing a musical instrument, Link must blow into a piece of Horseshoe Grass to perform the song initially. Later on, the portable Horse Call allows this song to be played anywhere, instead of just where certain patches of grass can be found.

While in Wolf Form, Link can howl the song to summon Epona whenever he's near a patch of Horseshoe Grass. However, he can only ride Epona while in human form.

Ilia's theme is also a rearranged Epona's Song.

Trivia

 * Wind's Requiem from The Wind Waker uses the same arrow directions to play the song as Epona's Song does.
 * A vocal version of this is sung by Emiko Shiratori, and available in the Ocarina of Time Re-Arranged Album. The vocal version of the song was also sung in the Mario and Zelda Big Band Live Show, which was also released on soundtrack.