35978d12_Zelda___Majora_s_Mask____Songs__Where_to_play
[How to play] Song of Double Time [How to learn] Like the Inverted Song of Time, this song can also be played without formally learning it, but if you want to be old school (for some reason, I've decided to make that old school...probably because I rarely get to say old school anymore...) you can talk to the scarecrows in either West Clock Town's Item shop or the observatory. [Where to play] 
Again, like its partner in crime, the Inverted Song of Time, you can play this guy anytime of the day. It will make time go ahead to the next interval of time. For example, if you play this song on the night of the first day, it will take you to the dawn of the second day. As you can see, you have one restriction. You can't play this song on the night of the final day. If you could then Link would wake up to a moon-smushed town. o_O;; Some Hero of Time he would be!
The Legend of Zelda : Majora's Mask -- Songs
Where to play