London, Aug 4 - English singer Robbie Williams has written down a song about Michael Jackson as a tribute to the late King of Pop.

'Michael Jackson died. It's all so very sad. I couldn't get a lyric to fit on one of the new songs, so when he passed away, I rewrote it with him in mind,' femalefirst.co.uk quoted Robbie Williams as saying.

Jackson died June 25.

The 35-year-old pop star also admits he took help from lyricist Don Black.

'I was having a tough time with lyrics for a little while. Nothing would come out. Don kindly came in and gave me a helping hand, I'm honoured,' Williams said.

The album is all set to release later this year.