it would be cheap to say the first 6 Black Sabbath albums - we all know about those.
But how about:
UFO - Strangers In The Night
Scorpions - Crazy World
Scorpions - Tokyo Tapes
Accept - Balls To The Wall (except Jonathan already picked that one!)
Rainbow - Rising
Judas Priest - Painkiller
Diamond Head - The White Album
I would not wish to change a track on any of these classics
(edit: just realised theres Flying Vs on all but one of those choices!)
Scorpions - Lovedrive, Blackout and Love at first Sting
UFO - Force It , Obsession, Lights Out and Strangers in the Night (of course)
MSG - debut album and MSG (2nd album), Save yourself as well as One Night in Budokan
Kiss - Alive 1
Queen - Queen 2, Sheer Heart Attack, Night at the opera, News of the World and The Game
KIng Kobra - Ready to strike
Whitesnake - Ready and Willing and Slide it in
Lizzy Borden - Visual Lies
Twisted Sister - Love is for suckers
Great White Once Bitten (USA version)
Aerosmith - Rocks
Cinderella - Night Songs
Def Leppard - High N Dry
Kate Bush - the kick inside
Evanescence - fallen
Fleetwood Mac - rumours
Boomtown Rats - Tonic for the troops
Night Ranger - Dawn Patrol
Paul Stanley - first solo album
Ace Frehley - first solo album
Ratt - out of the cellar
Rammstein - Mutter
Y&T - Meanstreak & Ten
Van Halen - first LP !!!!