Name a few albums which helped determine your musical tastes

MC, you can do what you will with the question.
By "shaped" or "pivot" I mean those albums which turned me on to music, and also to those bands. E.g. Beatles -- lead to a love of the Beatles, of course, but to rock more generally and to the less straight ahead (psychedelic-style of openness) which made my tastes in Pink Floyd, Fripp, Eno, etc. later on. Or, Joni, which opened me toward more female vocals; or Tull, Simon/Garfunkel which created a taste for folk. Etc.

Radiohead - Kid A
Bjork - Post
Beck- Odelay
Neutral Milk Hotel - In An Aeroplane over the Sea
Stereolab - Emperor Tomato Ketchup

Cavalli, Ercole Amante (Corboz, cond.)

Mozart, Cosi fan tutte (K. Boehm)

Wagner, Gotterdammerung (Boehm, Bayreuth) 

Beetles, Sgt. Peppers

Hendrix, Axis Bold as Love

J. Airplane, After Bathing at Baxters

Shostakovich, Quartets (Borodin Q.)

Gould, Goldberg Variations (studio version, Sony)

in the beginning, these spring to mind

Rolling Stones, 1st and all till Goat's head soup
Beatles Rubber Soul on (too simpy up till then)
Moody Blues, original band, Mike Pinder, piano based blues, before Justin Hayword
Animals, Awesome music and Eric Burdon's voice
Kinks, great stuff
Zombies, oh yeah
Dylan, hated at first, finally listened, amazing songwriter
Donovan, still terrific live
Simon and Garfunkel. Mad for years when they broke up.
Ian and Silvia, irresistable vocal talent
Everly Bros, irresistable vocal talent and some great lyrics
Doors, attitude
Janis Joplin, attitude
Jose Feliciano
Van Morrison
Fontella Bass, voice, songs, horns
Otis
The Mamas and the Papas

Records that turned my head around and opened new worlds.

Tchaikovsky Fifth Symphony, conducted by Sir Adrian Boult.
Meet the Beatles.
Peter, Paul & Mary, In the Wind.
David Bowie, Aladdin Sane.
Sex Pistols -- Never Mind the Bollocks.
Kind of Blue.
The Harder They Come soundtrack.