Another source.
A series of books by Dean Koontz about a character who can see the "lingering dead" called Odd Thomas. That's right Odd not Todd, his parents had a weird sense of humor.
In the book Brother Odd on page 237, Odd Thomas is with the lingering spirit of Elvis and he says this:
"When making his music, he had been the essence of cool, but in his movies he was often a self-parody embarrassing to watch. Colonel Parker, his manager, who had picked movie scripts for him, had served Elvis less well than the monk Rasputin had served Czar Nicholas and Alexandra."
Anyone interested in strange mysteries fiction with a tongue in cheek flair should check out the "Odd Thomas" series. There are five books in the series, but, in my opinion, only the first three are very good. The last two are just OK. In #5, though, Koontz brings in the spirit of Nikola Tesla one of the greatest inventors whose patents actually were filed before some of Edison's and Marconi's, but Tesla was a strange duck, stranger than Einstein, and he didn't get much credit for what he did do. Tesla was the person who proved that AC power was better and could be sent longer distances than Edison's pet project DC power.
I have been finding Tesla mentioned in a number of spooky fiction books and it got me to buy a biography of the man. I haven't finished it yet, but the man was truly a genius and Einstein and Mark Twain both knew him and agreed on that.