Def Leppard guitarist Phil Collen looks back at 40 years of 'Pyromania'

Def Leppard guitarist Phil Collen has fond memories of working on their Diamond-certified album Pyromania, which was released 40 years ago.

Pyromania was a huge hit for the band, peaking at #2 thanks to hit songs "Photograph," "Rock of Ages" and "Foolin." Collen says that while those songs were being played all over the radio and on MTV, it wasn't until they toured the United States that they realized how big a hit they had.

To celebrate the anniversary, Def Leppard just released a 40th anniversary deluxe edition of Pyromania featuring unheard demos from the band's archives. Front man Joe Elliott took a very hands-on approach to finding these unreleased tracks, which according to Collen probably wasn't too difficult for him.