“I thought I’d make the notes count, like Jeff Beck. It doesn’t sound anything like Jeff, but that was the intention going in!” Phil Collen on how – by accident and design – Def Leppard reinvented rock guitar on classic album Pyromania

Pyromania is 40 years young this year is still fresh as a daisy. Collen explains how tones, solos, Mutt Lange and the art of recording one string at a time forged a pivotal moment in rock