When an album of previously-unreleased songs from their hero Michael Jackson was released a year after his death it seemed, some astute fans feared, too good to be true.

Today, it appeared those suspicions may not necessarily have been unfounded, as a record label was caught up in an extraordinary dispute over whether three songs were really performed by the late singer himself.

A court case, revolving around the release of posthumous album in 2010, saw a fan of the singer take on Sony Music Entertainment, alleging songs on the record were not sung by the late artist.

After enlisting the help of a forensic audiologist, she took the case to court claiming 'Breaking News', 'Monster' and 'Keep Your Head Up' had been falsely promoted.

Lawyers filed documents claiming Sony had conceded the lead singer “may have turned out not to be” Jackson, alleging “it turned out that these songs were sung by a Jackson impersonator”.