Transform male to female vocal (autotune,vocoder,etc)

[estuary]

Hi,

I am trying to figure out what is best way to transform male vocal into female vocal using reason or any other software.
This is first time that I am trying to accomplish that thing, so I am asking you guys if you have any knowledge / advices.

Best example and great rendering is :

Air - Cherry Blossom Girl


Thank you !

[robotgard]