"While the vast majority of the shows here sound fantastic, there are issues with some recordings. The collection is gathered from three sources. The earliest concerts were not professionally recorded, and the handful represented - three in the US, one apiece in Melbourne and Stockholm - come scavenged from tapes made by bootleggers in the audience. Invaluable as muddy snapshots of atmosphere, they are hard to listen to as music.At the other end of the fidelity scale are four concerts recorded by Columbia Records using multi-track equipment: the previously released Manchester show; the hypnotic Sheffield gig; and the tour's final two-night stand in London on May 26 and 27, when, before an audience that included Beatles and Stones, Dylan's patience ran out, and he announced he wouldn't be coming back. The first of the London shows is also being given a stand-alone release as The Real Royal Albert Hall 1966 Concert, newly remixed for this set by Chris Shaw - Dylan's engineeronrecent recordings including 2001's masterpiece "Love & Theft" - who wrings every last drop of ambient beauty from the truly otherworldly acoustic set.The bulk, however, are the raw recordings Dylan's sound engineer made each night using a tape recorder plugged directly into the mixing board. Intended for possible use in Eat The Document, the anti-documentary Dylan was filming as the tour progressed, these are the same tapes he and the band listened to after each show, trying to work out if it was them or the booing audiences who had gone insane. They come at you in glorious mono, warts and all: a few songs missing, tapes sometimes running out mid-tune. But you can't put a price on this stuff. Putting you right onstage, this is history in a box, exploding".