In the Court of the Crimson King is the one rock album I would choose if I could only choose one. No rock album has ever sounded as good to me as that one.
Others:
Maggot Brain - Funkadelic
Are You Experienced, Axis: Bold as Love - Jimi Hendrix
Led Zeppelin's first 3 albums (never got around to Houses of the Holy and LZ IV)
Lynyrd Skynyrd's first two albums
Nevermind (on certain days)
The ones that I first think of.
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There's no Heavier Burden than a Great Potential! - Linus