Key points: The technology used to bring dead singers back to life is getting better.
The much-loved British singer, who struggled for years with drug and alcohol addiction while producing hits like Rehab and Back To Black, died in 2011.
It is not the first time a dead musician has been resurrected on-stage via the magic on technology.
In the process, they hope to unlock vast amounts of money in the back catalogues of the 20th Century's biggest artists.
The current crop of productions are 2D video projections, rather than proper holograms, and they are pre-recorded, not live.
From there, the video will be rendered and the light will be fixed to make shadows fall where they should.
For Mr Seymour, the success of a performance will come down to an individual audience member's willingness to buy in. »