35978d12_Zelda___Majora_s_Mask____Songs__Where_to_play
[How to play] Song of Healing [How to learn] Once you have learned the Song of Time and you have returned to the dawn of the first day, go talk to the mask salesman in the clock tower. He'll keep his end of the bargain and teach you the song, though you didn't live up to your end.... [Where to play] 
There are many things you can do with this song. If you play it for a Gossip Stone, the stone will surrender a fairy you can bottle. Also, by playing it when you first learn it, you will transform back into human Link and create the Deku mask. You can also play it for Darmani the goron, Mikau the zora, Kamaro the dancing ghost and the father in Ikana Canyon to give you the Goron mask, the Zora mask, Kamaro's mask and the Gibdo mask, respectively. Finally, by playing it to the ledgekeeper in Ikana Canyon in his house, he will lower the price of his minigame! ^_^
The Legend of Zelda : Majora's Mask -- Songs
Where to play