On this day in 1971, Led Zeppelin released their untitled fourth album, commonly known as 'IV'. From the opening Black Dog, through to Rock and Roll, and Stairway to Heaven, it's an album full of classics. What's your favourite song on it? | Absolute Radio

The untitled fourth studio album by Led Zeppelin, commonly known as Led Zeppelin IV, was released on 8 November 1971 by Atlantic Records. It was produced by Jimmy Page and recorded between December 1970 and February 1971, mostly in the country house Headley Grange. The album's most well-known song is "Stairway to Heaven". The informal recording environment inspired the band, allowing them to try different arrangements of material and create songs in various styles. After the band's previous albu