Both albums have been remastered by guitarist and producer Jimmy Page, and come with a companion disc of unreleased related material.
Each will be available in single CD, deluxe 2CD, single LP, deluxe 2LP and digital formats. Super deluxe box set editions contain CD, LP and digital formats, 80-page hardback book and a high-quality print of the original album cover – the first 30,000 of which will be individually numbered. Find out more here.
Originally released in November 1971, "Led Zeppelin IV" has been certified 23x platinum and entered the Grammy Hall of Fame in 1999. "Houses of the Holy," launched two years later, has sold more than 11 million copies.