I was thinking which albums absolutely define their genre - and I've broadened some genres to prompt the debate.

Here goes

Classic AOR - Escape by Journey
Modern AOR - Coup De Grace by Treat
Euro Rock - Lip Service by Gotthard
Classic Rock - Zep IV
Modern Rock - The Sound Of Madness by Shinedown
Metal - The Black Album by Metallica
Prog Rock - Aqualung by Tull
Modern Prog Rock - Images and Words by Dream Theater

So what's your defining albums??

Fill yer boots.......