Just happened to be passing by…

At this particular moment it would be…

Revolver (to blow my mind)
The Who Live At Leeds (turned up to 10)
Close To The Edge (on headphones)

Ask me again tomorrow.

☮️

ps… y’all have great taste 😉

Fleetwood Mac? Never heard of them...

in order of appearance -

Santana - Abraxas
Pink Floyd - Dark Side of the Moon
Supertramp - Crime of the Century
all during young, formative times. 

very honorable mentions
ZZTop - Tres Hombres
Neil Young - Harvest
Bruce Springsteen - Born to Run
Steely Dan - Pretzel Logic

There are actually quite a few I’ve found on RP that would work as well.

my parents had a mono portable system and collected classics (Borodin, etc.) and Dad was heavily into Heintje and Herp Albert so my first exposure to something that stopped me in my tracks was hearing the neighbouring students play After the Goldrush late at night, LOUD, at a party in the backyard. 
So definitely that one. 
Others:
Close to the Edge
Life in the Bush of Ghosts

Kind of glad I grew up with the advent of home stereo.

Three that stopped me in my tracks at the time:

Dark Side of the Moon — Pink Floyd
A Wizard, A True Star — Todd Rundgren
Horses — Patti Smith


edit: I just saw Patti Smith on her 50th anniversary of that album so it was front of mind. It was different — and powerful. Then and now,

If I had a gun to my head and had to pick just three -  all live albums:
Little Feat - Waiting for Columbus
AB - Live at Fillmore
Grateful Dead - Skull & Roses

On this cold grizzly drizzly December day I would play these three since I haven't heard them before...
(theoretically speaking)

 Coaxial wrote:

Solid choices. I do remember listening to Sargent Pepper's for the first time and it was pretty mind blowing

 oldviolin wrote:

Today?

I never heard (pants on fire)

Steppenwolf Live

Humble Pie Rocking The Fillmore

Allman Brothers Live At Fillmore East

looking forward to the listening and a stomp or two

still dark. Dial still green

 haresfur wrote: 
Curved Air is an interesting choice. Side A of the Second Album, Young Mother has some of the hookiest synthesizer licks I've ever heard. I still play it somewhat regularly. Tough choices but I would likely pick Phantasmagoria for a brand new 1st listen of a Curved Air album.  Just played a couple of tracks several days ago.

After a couple of minutes of thought ...

TABB Idlewild South (Beginnings would be cheating because it has the first two albums)

Floyd  Animals 

The Who Tommy 

Rush - 2112
Todd Rundgren - A Wizard, A True Star
Warren Zevon - Excitable Boy

Lamb Lies Down on Broadway
Moving Pictures
Quadrophenia
Kid A

EDIT: Post Kurt's Tommy... I thought of a replacement for Moving Pictures.

Pink Floyd:  Dark Side of the Moon
King Crimson: In the Court of the Crimson King
Alan Parsons: I Robot

Sgt. Pepper's

Disraeli Gears

Surrealistic Pillow

Hard to narrow it down, but...
The Rolling Stones - Sticky Fingers
The Beatles - Abbey Road
The Colourfield - Virgins and Philistines*

*That last one may seem out of place, but though I enjoyed Terry Hall's earlier work with The Specials and Fun Boy Three, I didn't know what to expect from his new endeavor. That album made quite an impression on me.

Lots of great choices from everybody.  

For starters ...
Manassas  Steven Stills
Fox Confessor Brings The Flood  Neko Case
Surfs Up  Beach Boys

No drinking or smoking required.

Jethro Tull - Living In The Past
John Lord - Sarabande
Chick Corea - Return To Forever

Off the top of my head:

Jimi Hendrix Experience, Are You Experienced?

Pink Floyd, Meddle

Nick Drake, Pink Moon

*Went back and forth on swapping Curved Air, Second Album for Pink Floyd Meddle but then I remembered McDonald and Giles, but then I realised I had listened to Curved Air and McDonald and Giles for the first time in maybe decades on YouTube, so that was quite like listening to them for first time, so I went back to Meddle, even though Pink Floyd loses out on the obscurity bonus points

Pink Floyd's "Dark Side of the Moon" was mind-blowing when I first heard it as a pre-teen. I was amused by traveling back in time when I was partially sedated for a cataract surgery and the surgeon (who looked suspiciously like Jon Hamm) DSOTM played in the background. Trippy stuff. 

Hated U2's "Zoo Station" when I first heard it. Love it now.