Which singer has the best voice?

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There are many awesome vocalists out there...i want your choice on who has the best voice, i.e able to portray all emotions and takes u on a ride....my favourite is James Maynard Keenan who is the frontman for the progressive rock band, Tool...if u wanna appreciate his talent, jus try to get (John Lennon's)Imagine cover by A perfect circle(he fronts that band too).....among the female voices i like Dido.