*One album per artist/band.
*Major blind-spot from 70's to mid-80's. Seriously, not my favourite era.
*No metal, hip-hop or punk because I'm not well-versed in any of those genres.
*Chose exclusively critically acclaimed albums to reduce the amount of ensuing butthurt.
*NOT EXHAUSTIVE.


Alpha:



























 
60s:



The Beatles - Revolver
King Crimson - In The Court of the Crimson King
The Beach Boys - Pet Sounds
The Mothers of Invention - Freak Out!
Simon and Garfunkel - The Sound of Silence

70s:



Rush - 2112

80s:




Sonic Youth - Daydream Nation (or Beta)
The Talking Heads - Remain In Light
Tom Waits - Rain Dogs

90s:




Beck - Odelay
Bjork - Homogenic
My Bloody Valentine - Loveless
Weezer - Weezer
Pavement - Slanted and Enchanted

00s:



Radiohead - Kid A
of Montreal - Hissing Fauna, Are You The Destroyer?
Broken Social Scene - Broken Social Scene
Sufjan Stevens - Illinoise

"Typical"[1] Alpha Genres: Progressive rock, psychedelic pop, math rock, shoegaze, progressive metal, japanoise, harsh noise, IDM, certain brand of pop music similar to of Montreal whatever it's called, early 90's indie rock, Pavement, Sabadoh et al.

Beta:

































 
60s:


The Doors - The Doors
The Velvet Underground - White Light/White Heat

70s:



David Bowie - Low
Joy Division - Unknown Pleasures
Queen - Night at the Opera
Miles Davis - Bitches Brew
The Who - Who's Next

80s:

THE SMITHS OR SOMETHING

90s:



Jeff Buckley - Grace
Liz Phair - Exile in Guyville
Nirvana - In Utero
Pearl Jam - Ten
Nas - Illmatic

00s:



The Arcade Fire - Funeral

"Typical"[1] Beta Genres: 70's punk rock, glam rock, grunge, psychedelic rock, 90's hip hop, um drawing a blank.

Gamma:






























 
60s:


Bob Dylan - The Times They Are a-Changin'
The Jimi Hendrix Experience - Electric Ladyland
John Coltrane - A Love Supreme

70s:

:|

80s:


Minutemen - Double Nickels on the Dime

90s:
Fugazi - Repeater

00s:



Godspeed You! Black Emperor - Lift Yr. Skinny Fists Like Antennas to Heaven
Kanye West - College Dropout
The White Stripes - Elephant
Bat For Lashes - Two Suns


"Typical"[1] Gamma Genres: post-hardcore, idk, gamma is still the most elusive quadra to me.

Delta:




























 
60s:



The Kinks - Village Green Preservation Society
The Zombies - Odessey and Oracle

70s:



Joni Mitchell - Blue
Jethro Tull - Thick as a Brick

80s:

????

90s:



Neutral Milk Hotel - In the Aeroplane Over the Sea
Eels - Electro-Shock Blues
Belle and Sebastian - If You're Feeling Sinister
Elliot Smith - Either/Or

00s:



Gorillaz - Demon Days
Iron & Wine - Shepherd's Dog
The Mountain Goats - The Sunset Tree


"Typical"[1] Delta Music: bubble-gum pop, 90's indie pop, twee, singer-songwriter, folk pop, folk jazz, certain brands of punk, (and I guess if Absurd's taste is to be considered) Oi! et al.

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[1] Excludes "contemporary" music or very wide umbrella terms like "indie" or "pop". Also doesn't include styles (i.e. "electronic") but the themes, mood, etc. Stereotyped and exaggerated on purpose.