Since you're a young whippersnapper, I'll add my own:

1955-1959 Musical "Albums" hadn't really been invented yet

1960 "Nice and Easy" Frank Sinatra

1961 Tie "Goin' Places" Kingston Trio/"The Smothers Brothers at the Purple Onion"

1963 "Please Please Me" The Beatles

1964 "South of the Border" Herb Alpert & the Tijuana Brass

1965 "Highway 61 Revisited" Bob Dylan

1966 "Pet Sounds" The Beach Boys

1967 "Disraeli Gears" Cream

1968 "Electric Ladyland" Jimi Hendrix Experience

1969 "Abbey Road" The Beatles

1970 Tie: "Stage Fright" The Band/"Deja Vu" CSN&Y

1971 "Live at Fillmore East" Allman Brothers

1972 "Transformer" Lou Reed

1973 "Quadraphenia" The Who

1974 "Pretzel Logic" Steely Dan

1975 "Flying Again" The Flying Burrito Brothers

1976 "Hotel California" The Eagles

1977 "Bridges" Gil Scott Heron

1978 "Kaya" Bob Marley

1979 "The Wall" Pink Floyd

I guess this reflects changing tastes brought about by our dynamic American society. Funny how from '65 to '74 there were too many choices (my jr high to early college years) and after that not enough!