Led Zeppelin split on December 4th 1980, 2 months after the tragic death of iconic drummer, John Bonham. Throughout the 1970's, at the height of the bands powers, Led Zeppelin became the world's first rock supergroup, selling over 300 million albums and headlining 600 concerts worldwide. Zeppelin's rock star excesses became the stuff of legend, and dark rumours swirled around their closely guarded inner circle as everything Zeppelin touched miraculously turned to gold. But after nearly a decade at the top, disaster engulfed the band, and fans speculated that Zeppelin was finally paying the price for their huge success. And 40 years after the split, Zeppelin's popularity still hasn't faded; fans, new and old, clamour for a final reunion, which has been described as the "billion dollar tour" by promoters worldwide. But lead singer, Robert Plant, has sworn that he will never play with Zeppelin again, denying lead guitarist Jimmy Page and bass guitarist John Paul Jones the reunion they want. So what really happened to the once close members of the world's greatest ever rock band? Why won't they ever play together again?