Led Zeppelin II is the second studio album by the English rock band Led Zeppelin, released on 22 October 1969 in the United States and on 31 October 1969 in the United Kingdom by Atlantic Records. The album’s production was credited to the band’s lead guitarist and songwriter Jimmy Page, and it was also Led Zeppelin’s first album on which Eddie Kramer served as engineer. The album exhibited the band’s evolving musical style of blues-derived material and their guitar riff-based sound. It has been described as the band’s heaviest album. Six of the nine songs were written by the band, while the other three were reinterpretations of Chicago blues songs by Willie Dixon and Howlin’ Wolf.