Might as well actually post what the topic asked. I have heard those in bold, and heard songs from the album of those underlined without having heard the entire album. Those that are bold AND underlined are the ones I really really like:
* Amon Düül II - Yeti
    * Atheist - Unquestionable Presence
    * Bathory - Blood Fire Death
    * The Beach Boys - Pet Sounds
    * The Beach Boys - Smiley Smile
    * The Beatles - Revolver
    * Belle & Sebastian - If You're Feeling Sinister
    * Ben Folds - Rockin' The Suburbs
    * Ben Folds Five - Whatever And Ever Amen
    * Bob Dylan - Blood On The Tracks
    * Comus - First Utterance
    * Converge - Jane Doe
    * Cynic - Focus
    * Faith No More - Angel Dust
    * Fall Out Boy - From Under The Cork Tree
    * Frank Zappa - We're Only In It For The Money
    * Galt MacDermot - Hair
    * The Grateful Dead - American Beauty
    * Grief - ...And Man Will Become The Hunted
    * Harry Chapin - Verities & Balderdash
    * Imogen Heap - Speak For Yourself
    * Isis - Celestial
    * King Crimson - In The Court Of The Crimson King
    * Led Zeppelin - Led Zeppelin IV
    * The Mars Volta - De-Loused In The Comatorium
    * Metallica - Ride The Lightning
    * Pelican - Australasia
    * The Pentangle - Basket Of Light
    * Pink Floyd - The Dark Side Of The Moon
    * Pink Floyd - The Wall
    * Radiohead - Hail To The Thief
    * Robin Trower - Bridge Of Sighs
    * Rush - 2112
    * Sigur Rós - ( )
    * Slayer - Reign In Blood
    * Tom Waits - The Heart Of Saturday Night
    * Tom Waits - Swordfishtrombones
    * Elton John - Goodbye Yellow Brick Road
    * Iron Butterfly - In-A-Gadda-Da-Vida
    * Michael Jackson - Thriller
    * Thin Lizzy - Jailbreak
Also a few more nominations: 
-Apocalyptica could be on there somewhere. 
-Carcass should be on there somewhere.
-Mastodon - Leviathan, maybe
-Sepultura - Roots
-Symphony X - Paradise Lost (Or The Odyssey)
-Dethklok - The Dethalbum   
-The Living End - Roll On
-The Prodigy - The Fat Of The Land
^^