Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Def Leppard's breakthrough!

People who only know Def Leppard for their Hysteria album may dismiss them as a cheesey band,but then I guess they would never have heard Pyromania to do that.Def Leppard's Pyromania helped open the door to hard rock/pop metal being one of the most popular musicial tastes in the 80's.Rock Rock Till you Drop is a great way to kick off an album, one of the heaviest rockers on the album.Then there's classics such as Photograph,Foolin',Stagefright,Too Late for Love,Die Hard the Hunter,Rock of Ages,and Comin under Fire on the album too.Hard rock/Metal fans can't deny the power of Pyromania.This is one of the finest albums of the 80's popmetal era.