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More mature and musically complex than the fairly conventional albums that came before, Rubber Soul was the band's most serious project to date.
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Number 3 on Rolling Stone's list of greatest albums, Revolver was by far the band's most ambitious studio project to date. One song, "Tomorrow Never Knows," employed every techno-trick in the book from mechanically-filtered voices to a backwards guitar track.
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Rolling Stone called Sgt. Pepper's the greatest album of all time (and the Beatles' best)—not just for its music but also it conceptual basis, cover art, and studio technology.
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Another Rolling Stone top ten album, this 1968 release contains some great music. But the tensions within the band were starting to surface and, as a result, the conceptual coherence of Sgt. Pepper is a thing of the past.