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  led zeppelin I 1968

  the conceptual originality of the album was displayed on tracks such as "good times bad times", "dazed and confused" and "communication breakdown", which had a distinctively heavy sound to the ears of young rock fans in the late-1960s.
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  led zeppelin II 1969

  led zeppelin II furthered the lyrical themes established on their debut album, creating a work that became more widely acclaimed and influential than its predecessor. with elements of blues and
  folk music, it also exhibits the band's evolving musical style of blues-derived material and their guitar and riff-based sound. it is one of the band's heaviest albums.
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  led zeppelin III 1970

  composed largely at a remote cottage in wales known as Bron-Yr-Aur, this work represented a maturing of the band's music towards a greater emphasis on folk and acoustic sounds. this surprised many fans and critics, and
  upon its release the album received rather indifferent reviews.
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  led zeppelin IV (zoso) 1971

  no title is printed on the album, so it is generally referred to as led zeppelin IV, following the naming standard used by the band's first three studio albums. also the album has alternatively been referred to as zoso.

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