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Queen guitarist Brian May has revealed that Freddie Mercury will "appear" on stage during a special performance of West End musical We Will Rock You.

He told the ����ý that the production team had been working on ways to give the late singer a presence during its 10th anniversary show for some time.

May stressed the new "effect" was not a hologram, calling it "an optical illusion of sorts".

"People will come out saying, 'did we actually see Freddie?'" he added.

The guitarist hinted the musical might employ a similar technique to the one used to make the late rapper <link> <caption>Tupac Shakur perform on stage</caption> <url href="http://www.mtv.com/news/articles/1683173/tupac-hologram-coachella.jhtml" platform="highweb"/> </link> at the Coachella music festival last month.

"It's a little unfortunate they did that thing with Tupac as we've been trying to make Freddie appear on the stage for quite a while," he said.

"[That technique] is something we've looked at ourselves but I think probably for a show that runs eight shows a week it's not really quite practical."

The special performance, on 14 May, will celebrate 10 years of the hit musical at London's Dominion Theatre.

As well as almost all the original London cast in attendance, Hollywood star Robert De Niro - who is one of the show's producers - will also be making an appearance.

"There is a certain person who's coming that's intimately associated with getting the production on in the first place - our friend Bob from Los Angeles," May confirmed.

"We call him Bob so we don't get too overcome with his stardom."