Off the top of my head 69 seems tops...

In A Silent Way - Davis
Court of the Crimson King
Let It Bleed
The Velvet Underground
Hot Rats
Karma - Pharaoh Sanders
At San Quentin
Arthur or the Decline and Fall of the British Empire
Hot buttered Soul
Willy and the Poor Boys
Trout Mask Replica
Green River
Uncle Meat
Bayou Country
Kick Out The Jams
Nipples
Ummagumma I think...

1329 without a doubt.

1988 of course was nice...

Tender Prey - Nick Cave
...Nation of millions - Public Enemy
You Can't Do That on Stage - Frank Zappa
Transcendence - Crimson Glory
The Serpents Egg - Dead Can Dance
Last Exit - Iron Path
Danzig - Danzig
Delicate Sounds of Thunder - Pink Floyd

1966

The Good, The Bad and the Ugly
Revolver

My two favorite albums of all time.

Plus
Blonde on Blonde
Pet Sounds
Freak Out!
Face to Face
Aftermath
Animalism
The Psychedelic Sounds of the 13th Floor Elevators
River Deep - Mountain High
Fresh Cream
Fifth Dimension
How Does That Grab You?
Swinging Doors and the Bottle Let Me Down
The Magic City

Personally? '06. That's just because I was alive and that's the year that influenced me the most.

Arab Strap-The Last Romance
Arctic Monkeys-Whatever People Say I am...
Beck - The Information
Brandtson - Hello, Control
The Decemberist - The Crane Wife
The Dresden Dolls - Yes, Virginia...
Explosions In The Sky - All of a Sudden I Miss Everyone
Gnarls Barkley - St. Elsewhere
The Klaxons - Myths of the Near Future
Man Man - Six Demon Bag
Massive Attack - Collected
Of Montreal - Hissing Fauna, Are You The Destroyer?
She Wants Revenge- She Wants Revenge
Silversun Pickups - Carnavas
TV on the Radio - Return to Cookie Mountain
and so on.

1967 : Sgt Pepper's Lonely Hearts Club Band ! :D

Best year in music...Honestly, I'm not really sure. Not having a 'clear favorite band/artist' doesn't really help. There are many bands I like almost equally. In terms of "Importance", there are quite a few choices there as well. I think It'll take me a while to sort this out.

1988 :D

All because of:
Daydream Nation
Bug
Surfer Rosa
Isn't Anything

Next would be 1991

This is one I cannot answer. One from each deacde would have been a better choice methinks.

Yeah maybe 4/5 different threads and polls asking the best from a decade, then add all those years in one poll after... A bit overwhelming with so many in one poll.