Queen drummer Roger Taylor has spoken out about his dealings with the executors of Michael Jackson's estate over his plans to release a forgotten King of Pop/Freddie Mercury duet, revealing they have been "difficult" to deal with.

Taylor and his bandmate Brian May were hoping to add the song the two late music icons recorded together on the upcoming album Queen Forever, but the estate bosses are refusing to grant permission.

The rocker tells the London Evening Standard, "William Orbit did a really nice mix of one of our tracks with Michael and I'm pretty certain that will be on Queen Forever. But it's been like wading through glue."

Taylor is still hopeful that he and May will be given the Ok to include the track, admitting he's still not sure what will make the new album.

He adds, "We've got some great new tracks that haven't been heard and there's an interesting selection of older stuff."

May and Taylor are currently on tour with former American Idol star Adam Lambert.