I've visited Graceland twice and on both occasions what affected me were the homely details. The 70s toaster and microwave in the tiny kitchen. Elvis's private jet, the Lisa Marie, named after his daughter, parked near the house; at the back of the plane a double bed in which Elvis
Blue suede pews: Cult of Elvis on rise
Subscribe to listen
Shrines and churches around the world, like Australia's Presleytarian Church, already conduct Elvis worship. Photo / AP
But the Presley family no longer owns Elvis. In 2013, Authentic Brands Group, a business that markets images, took over from Elvis Presley Enterprises. Harrison argues Elvis is "rising Phoenix-like from the flames of the old family business, fanned and fuelled by international capitalism". Is Elvis safe in their hands, or will the bottom line be their only concern?
One of the ideas in Harrison's new book is that "maybe, as Christianity declines, an improbable Elvis faith will fill some of the vacuum".
He points, as evidence, to the words of a fan's offering at the graveside, which implicitly equates Elvis with Jesus and Graceland's meditation garden with the Garden of Gethsemane.
He talks to a psychiatrist claiming to have found "hundreds" of people who believe they communicate with Elvis psychically. He looks at shrines and Elvis churches, such as the Presleytarian Church in Australia, with its tenets ("Don't Be Cruel"; "Don't Be a Hound Dog").
Harrison's book invites comparison with Greil Marcus's brilliant Dead Elvis: Chronicle of a Cultural Obsession (1991). Marcus caught the spirit of Elvis better than anyone. The point, he wrote, is that Elvis is not comprehensible; certainly not with the standard reductive blather about how he blended white country and black blues.
"You can listen to every proto-rockabilly singer ... and what you hear in Elvis simply isn't there. You can listen to Elvis at the very beginning and it is there; you just can't tell what it is."
Eternal Elvis
• In 2014, there were worrying rumours that Elvis's two planes were to be moved away from Graceland to make room for shops or hotels. Fans protested and the aircraft are still there. But perhaps soon you'll be able to invite a virtual Elvis to your party. Scientists may one day make a bodysuit with emotion-stimulating sensors so that his fans can "feel Elvis caressing and kissing them".
• August 16 next year will be the 40th anniversary of his death: in Memphis, they expect record numbers for the traditional candlelit procession of Elvis Week. In a big year, 70,000 visitors flock to Graceland's meditation garden, where he is buried. There is a fountain, an eternal flame and a statue of Jesus with his arms outstretched.