Simon & Garfunkel - "Bridge over Troubled Water" (1970)
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Boz Scaggs - "Moments" (1971)
The Beatles - "Let It Be" (1970)
Emerson Lake & Palmer - "Trilogy" (1972)
David Bowie - "The Rise and Fall of Ziggy Stardust and the Spiders From Mars" (1972)
Elton John - "Goodbye Yellow Brick Road" (1973)
Chicago - "The Chicago Transit Authority" (1969)
Rod Stewart - "Every Picture Tells A Story" (1971)
J. Geils Band - "Live, Full House" (1972) / "Bloodshot" (1973)
John Lennon - "Imagine" (1971)
And moving on to those all important college years...
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Bob Seger - "Night Moves" (1976)
Bob Seger - "Stranger in Town" (1978)
Bruce Springstein - "Born to Run" (1975)
Billy Joel - "The Stranger" (1977)
Allman Brothers - "Brothers and Sisters" (1973) While the album came out in 1973 I didn't get into it until 1975.
Eagles - "Hotel California" (1976)
The Doors - "The Doors" (1967) Again, this album came out before I was in college but that's when I got into it.
Janis Ian - "Between the Lines" (1975)
Boston - "Boston" (1976)
Chuck Mangione - "Feels So Good" (1977) Although I still listened to 7os rock, this album began my move away from listening to mostly rock and roll to mostly jazz (late 1970s-mid 1980s) and then to mostly country (late 1980s-mid 199os). Now I'm mostly into "oldies" of 70s rock, jazz, and country ;-)
These are the albums I think were the most influential to me in my teenage and college years. What about you? What albums influenced your formative years?