Led Zeppelin III is the third studio album by the English rock band Led Zeppelin. It was recorded between January and July 1970 and released on 5 October 1970 by Atlantic Records. 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.

Led Zeppelin II is the second studio album by the English rock band Led Zeppelin, released in October 1969 on Atlantic Records. Recording sessions for the album took place at several locations in the United Kingdom and North America from January to August 1969. Production was entirely credited to lead guitarist and songwriter Jimmy Page, while it also served as Led Zeppelin's first album to utilise the recording techniques of engineer Eddie Kramer.