Queen rocker Roger Taylor blames the executors of Michael Jackson's estate for a four-year delay in the release of the Thriller star's secret duets with Freddie Mercury.

The existence of several unreleased collaborations between the two pop icons was revealed by the band's guitarist, Brian May, in 2009, days after Jackson died from an overdose of anaesthetic.

Taylor and May worked together to finish the incomplete tracks and they are hoping the songs will be released later this year (13), but Taylor blames those in charge of Jackson's estate for holding up the project.

He tells Mojo magazine, "Freddie and Michael never finished the songs, because Queen had to leave L.A. to go on tour. Brian and I have worked on them, which means they'll come out as Queen and Michael Jackson - hopefully... if the Michael Jackson estate can get its a**e into gear."