Readers' Poll: The 10 Best Live Albums of All Time

The classic Ian Gillan-led lineup of Deep Purple (dubbed Deep Purple Mark II by the fans) had only been on the road for three years when they hit Japan in 1972. It was a very fruitful time for the band. They had three incredible albums under their belts (In Rock, Fireball and Machine Head), and their live show was absolutely stunning. They had no intention of making a live album, but they were talked into releasing material taped in Osaka and Tokyo for a Japanese-only live album. Their label loved it and released it worldwide. These are the definitive versions of "Highway Star," "Child in Time" and other Deep Purple classics. They've done countless shows since in countless permutations, but they've never sounded quite this perfect.