Led Zeppelin performed "Killing Floor" live in 1968 and 1969,[8] and it became the basis for "The Lemon Song", which they recorded on their 1969 album Led Zeppelin II. It was recorded in Los Angeles when the band were on their second concert tour of North America. In some early performances Robert Plant introduced the song as "Killing Floor"; an early UK pressing of Led Zeppelin II showed the title as "Killing Floor" and was credited to Chester Burnett (Howlin' Wolf's real name).[9] For the second and third North American tours the song evolved into "The Lemon Song", with Plant often improvising lyrics onstage (the opening lyrics to both songs are identical).