Frequently bootlegged and now digitally remastered by Jimmy Page, these tapes capture a 25-month (1969 to 1971) arc in which Zep's sound grew to encompass the speed rush and jazz\u002Fblues festival stuff of their 1969 debut, the fully developed folkie musings of Going to California (in which Plant vowed to make a hejira right up to Joni Mitchell's front door), and the band's modestly popular multilayered epic Stairway to Heaven. The Sessions also give a glimpse of nearly off-the-cuff invention in an intense take on Robert Johnson's Traveling Riverside Blues. Most other white blues musicians would've rushed to get this on vinyl; Page and Plant instead used it for parts, most notably taking its profound acoustic freneticism for Led Zeppelin III. --Rickey Wright