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Iron Maiden's The Book of Souls, due Sept. 4, is the band's first double album and its patiently awaited follow-up to 2010's The Final Frontier. The release contains the pioneering act's longest song ever at 18 minutes, and it marks singer Bruce Dickinson's return after having a cancerous tumor removed from his tongue.

Now we've got another piece to look forward to: The Books of Souls takes a minute—five minutes—to eulogize Robin Williams, who committed suicide a little over a year ago, on Aug. 11, 2014. Speaking to Italy's Corriere Della Sera, Dickinson said:

“My favorite song is one I didn’t write. It’s ‘Tears of a Clown,’ which talks about Robin Williams. I ask myself, 'How could he be so depressed when he always seemed to be so happy?'"

"Tears of a Clown" was penned by guitarist Adrian Smith and bassist Steve Harris, who has been the band's main songwriter since its 1980 debut. The title is either a nod to or a coincidental overlap with Smokey Robinson and the Miracles' 1967 hit.