"In the past, it was no wonder that great men and women built a bust or made sure that a statue was made of them in the square that would live forever. Now you can make avatars and it's clear that many people are interested in it," says Mattias Hansson, music journalist and former CEO and co-founder of the ABBA Museum.

Kiss have become known for their extravagant costumes and spectacular live shows, with pyrotechnics, lighting effects and smoking guitars.

On Saturday, the band ended their farewell tour at Madison Square Garden in New York – but towards the end of the concert, the band surprised the audience by introducing four flying avatars who performed "God Gave Rock 'N' Roll To You".

"We can become young forever and iconic forever by taking ourselves to places we never dreamed of before. The technology is going to make Paul jump higher than he ever has," Kiss member Gene Simmons said in a press video.

"Best in the world at selling products"

The avatars are designed by Star Wars creator George Lucas' company Industrial Light & Magic (ILM) and financed by Swedish Pophouse, where Björn Ulvaeus is a co-owner.

"It's a pretty low-hanging fruit to be part of the fact that Kiss is going to be avatars. Kiss is this ongoing fantasy world and it's been quite a long time since they became known for being the best in the world at selling gadgets around their product, such as coffins, says Mattias Hansson.

At the ABBA Museum, he was involved in producing holograms of the ABBA members and was visited by world stars such as Mick Jagger and Katy Perry.

"Even if it wasn't stated outright, I know that many people were there to see how they themselves might make a museum or avatars.

Is it a good business strategy for artists to become avatars or can they be perceived as too greedy?

"As with all art, it has to be good, if Kiss manages to create amazing avatars and an astonishing show, it will be a hit, but the level of originality is still crucial.