The track appears on the band's new album The Book Of Souls and pays tribute to the actor and comedian who took his own life in August last year. But the lyrics were penned by Maiden bassist Steve Harris and vocalist Dickinson says he didn't make the connection himself - even as he was recording his parts.

Dickinson tells Corus Radio: "Steve wrote the words to the song. He didn't tell anybody what it was about, and I had no idea when I was singing the song that it was about Robin Williams. So I finished doing the tune, and I went up to him and I said, 'These words are really cool. What's the genesis of the tune?' And he said, 'Robin Williams.' And I went, 'Wow!' It surprised the hell out of me, because it was so specific."