This double-LP set from Eagle Rock contains two discs of Deep Purple in their prime, recorded in 1971 and 1972 by the BBC for their In Concert series. The first LP is introduced by John Peel and features prime DP performances, including "Speed King" and lengthy versions of "Child in Time," the nearly 19-minute blues jam "Wring That Neck," and the Jimi Hendrix-inspired "Mandrake Root," which plods on for over 17 minutes. The second LP, introduced by DJ Mike Harding, was recorded just prior to the band's smash Machine Head offering, and therefore offers the very first public presentations of "Highway Star," "Smoke on the Water," "Maybe I'm a Leo," "Lazy," and "Space Truckin'," as well as an encore performance of Little Richard's "Lucille," rearranged in perfect DP excess. Hardcore fans of DP -- or those who are interested only in the band's best material -- will want this.