Windfall Island Music (Zelda WW) = Kakariko Village Music (OoT)

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A good number of the Wind Waker's tunes are rearrangements of older Zelda songs, as are tunes in many other Zelda games.

The music that plays while sailing is a rearrangement  (an exremely altered rearrangment) of the Hyrule Field music from the Ocarina of Time, as well.