Led Zep had endured a potentially permanent break after the death of Plant's young son Karac in 1977, and finally ground to a halt following Bonham's passing in 1980. Coda was released two years later.

But Page says he knows what the band would have done with their next studio title if they'd kept going: "Riffs. Interestingly-contructed riffs and hypnotic music," he says.