A plugin that can do this.
You write a text.
the plugin generates a voice after that text.
After that you can take a sample of an accapella of Elvis or Obama speaking etc... and the plugin analizes the sample and the voice characteristics and generates a voice that imitates pretty good that voice from the sample.
And you can also put midi notes on that voice and can manipulate certain parameters so that it sounds long/short up/down vibrato etc... like Obama/Elvis is singing but not like a vocoder or melodyne...more realistic & natural !
PS: and maby you can morph between the 2 voices Elvis to Obama
So with this plugin you can make new original songs with Elvis singing on a 2013 song