My top fifteen; some are chosen for SQ, some for musical merit over SQ. No Jazz or Classical here...that would be too tough!
The Band - The Band (their pinnacle for both)
Ry Cooder - Jazz (Paradise And Lunch has better songs).
Jimi Hendrix - Rainbow Bridge (I'd pick Axis for music, but RB has way better sound)
Grateful Dead - Blues For Allah (Side 1 medley takes all cakes)
Little Feat - The Last Record Album (you want bass?)
Mahavishnu Orchestra - Inner Mounting Flame (Apocalypse for SQ)
Joni Mitchell - Hejira (Blue for music)
Van Morrison - His Band & Street Choir (Moondance is better, but SQ lacking)
Pink Floyd - The Wall
Rolling Stones - Beggar's Banquet (Let it Bleed toss up)
Rod Stewart Gasoline Alley (I have a Polydor set of his 3 1967-1970 LPs on a clean UK pressing)
Talking Heads - Remain In Light (pure genius)
Junior Wells - Hoodoo Man Blues (best blues album evah!)
Neil Young - Harvest
Frank Zappa - The Grand Wazoo (has it all)