I like many of tprreaves' suggestions, here are some more:
Beatles--Abbey Road has good sound, but my favorite might be A Hard Day's Night (I like the stereo version, yeah, so shoot me)
Beach Boys--Pet Sounds, 90's (1996?) stereo remix
Dylan--Greatest Hits, Vol. II is a nice way to start. Or Biograph, even
better
Rolling Stones--Beggar's Banquet
Hendrix--Are You Experienced
Fleetwood Mac--any of the early releases (Peter Green version)
The Who--Live at Leeds
Pink Floyd--Meddle or Ummagumma
Paul Simon/Simon and Garfunkel--Bookends
James Taylor--Sweet Baby James
Mamas and Papas--Farewell to the First Golden Era
The Byrds--Sweetheart of the Rodeo
Santana--Santana
Joan Baez--Diamonds and Rust
Judy Collins--Who Knows Where the Time Goes
Mozart--Sinfonia Conertante/Oistrakhs (father and son)
Beethoven--piano sonatas, Alfred Brendel
Tchaikovsky--violin concerto, many great versions to choose from (Milstein, Sophie-Mutter, Heifetz, Stern, Rabin)
Bach--Goldberg Variations, either version ('55 mono, '81 stereo)
Gershwin--Gershwin plays Rhapsody in Blue
Beatles--Abbey Road has good sound, but my favorite might be A Hard Day's Night (I like the stereo version, yeah, so shoot me)
Beach Boys--Pet Sounds, 90's (1996?) stereo remix
Dylan--Greatest Hits, Vol. II is a nice way to start. Or Biograph, even
better
Rolling Stones--Beggar's Banquet
Hendrix--Are You Experienced
Fleetwood Mac--any of the early releases (Peter Green version)
The Who--Live at Leeds
Pink Floyd--Meddle or Ummagumma
Paul Simon/Simon and Garfunkel--Bookends
James Taylor--Sweet Baby James
Mamas and Papas--Farewell to the First Golden Era
The Byrds--Sweetheart of the Rodeo
Santana--Santana
Joan Baez--Diamonds and Rust
Judy Collins--Who Knows Where the Time Goes
Mozart--Sinfonia Conertante/Oistrakhs (father and son)
Beethoven--piano sonatas, Alfred Brendel
Tchaikovsky--violin concerto, many great versions to choose from (Milstein, Sophie-Mutter, Heifetz, Stern, Rabin)
Bach--Goldberg Variations, either version ('55 mono, '81 stereo)
Gershwin--Gershwin plays Rhapsody in Blue