The final world tour of 1979/80 found Bon Scott on the edge of the abyss, physically, mentally. For the first time, Angus, who had always looked up to Bon and loved him, began to openly fret.

Forty-five years ago today, the rock and roll world lost a legend when AC/DC frontman Bon Scott died in London.

Back in late 1979, the fledgling Def Leppard famously supported AC/DC on Bon Scott's final tour. For the young Joe Elliott it was a learning experience ("We watched them like hawks every night ...