I’m a big fan of classical but here is a list of my all time favorite non-classical albums, in approximate order, starting with my most favorites at the top:

Tarkus (ELP)
Trilogy (ELP)
Works Volume 1 (ELP)
Brain Salad Surgery (ELP)
Close to the Edge (Yes)
Aqualung (Jethro Tull)
Aja (Steely Dan)
Electric Ladyland (Jimi Hendrix)
Fragile (Yes)
Dark Side of the Moon (Pink Floyd)
Abbey Road (The Beatles)
Blind Faith (Blind Faith)
Thick as a Brick (Jethro Tull)
Wishing You Were Here (Pink Floyd)
The Doors (The Doors)
John Barleycorn Must Die (Traffic)
Romantic Warrior (Return to Forever)
Chicago 9 (Chicago)
The White Album (The Beatles)
Blood Sweat & Tears (Blood Sweat & Tears)
Heavy Weather (Weather Report)
Elegant Gypsy (Al DiMeola)
Friday Night in San Franciso (Paco de Lucia, Al DiMeola, John McLaughlin)
Selling England by the Pound (Genesis)
Goodbye Yellow Brick Road (Elton John)
The Six Wives of Henry VIII (Rick Wakeman)
Machine Head (Deep Purple)

How about yours?