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The title item is a small wand that lets you control the wind and time of day (among other things) with the help of six songs. The Wind Waker is basically the replacement for the Ocarina in previous games -- and it once again it helps to underline the strong musical themes of the Zelda games.
Unfortunately, using the Wind Waker tends to get a bit tedious at times as you're required to conduct a melody, then wait for it to be played before the desired outcomes goes into effect.
For the locations and uses of all six songs, check the Wind Waker Songs Section