List albums that gave you new perceptions on music, showed great progression from stuff you'd already heard or simply blew your mind upon initial listen.
Metallica - Master of Puppets
Judas Priest - Sad Wings of Destiny
Opeth - Morningrise
Amorphis - Elegy
Carcass - Necroticism: Descanting the Insalubrious
Slayer - Reign in Blood
Mr. Bungle - Mr. Bungle
Rush - 2112
Tool - Aenima
The Jimi Hendrix Experience - Are You Experienced?
Metallica - Master of Puppets
Judas Priest - Sad Wings of Destiny
Opeth - Morningrise
Amorphis - Elegy
Carcass - Necroticism: Descanting the Insalubrious
Slayer - Reign in Blood
Mr. Bungle - Mr. Bungle
Rush - 2112
Tool - Aenima
The Jimi Hendrix Experience - Are You Experienced?