Reclusive pop superstar Michael Jackson made a musical comeback of sorts on Wednesday, singing the chorus line of his charity single “We Are The World” before the sound cut out as he struggled for the high notes.

The 48-year-old, performing live for the first time since he was acquitted of child molestation charges in June, 2005, had been expected to sing his seminal hit “Thriller”.

But to the huge disappointment of screaming fans, that was performed instead by young U.S. star Chris Brown.

Jackson looked uncomfortable at times as he was surrounded by excited young members of a gospel chorus on stage with him.

That did not stop supporters desperate to see their idol cheer his every move, especially when threw his black sequin jacket into the crowd.

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Introducing Jackson, Beyonce said: “Tonight we are celebrating 25 years of ’Thriller’,” referring to his seminal album. “If it wasn’t for Michael Jackson I would never have ever performed. I love you, we all love you.”