Led Zeppelin's untitled fourth album was recorded between late 1970 and March 1971 and released in November that year. Many believe that this is their best record.
Led Zeppelin IV is packed with many of their best songs: Black Dog, Rock and Roll, The Battle of Evermore, Misty Mountain Hop, Going to California, When the Levee Breaks and Stairway to Heaven.
The versions that Jimmy Page's hours in the studio have delivered sound amazing.
Everyone is on song, and you can't help but notice the sheer impact of John Bonham's approach to drumming. Houses of the Holy, the follow-up, was recorded during 1972, and released in March 1973.
This was a very different album compared with what had preceded it. Their production values altered considerably with John Paul Jones in particular adding layers of keyboards and synthesisers.