The Sun's Song is one of the more interesting ocarina songs in the game. To learn it, you will need to go to the Kakariko Graveyard, near the entrance to the Shadow Temple as Young Link. The largest grave at the back of the graveyard has a trifoce symbol on the ground near it. Play Zelda's Lullaby to reveal a hole in the ground to gain passage to the underground crypt. Make your way through the passage, around the redeads and find the inscriptions on the wall. Once you see and read them, you will be taught the Sun's Song. You can use the Sun's Song to advance up to 12 hours through the day, from Sun up to Sun down or vice versa.