It is a sad fact, as I was told by Phil Ramone - a renowned engineer - that it one of the great crimes of the audio industry that the music archives are full of LP cutting-master tapes not the original master tapes. So for a lot of our historical music we have lost the art that was created, and are left with manipulated, in effect predistorted, master tapes intended to be used to drive cutter heads on lathes making LPs. When CDs came along there were technical problems in the early days, but hidden, unmentioned, is the reality that a lot of the archival music that was put on CDs was inappropriate for CD playback - it could not sound as good as the original master tape because that was long gone. When one compares a master tape with what comes out of a modern CD player, or any of the wider bandwidth options, it is a struggle to hear any difference at all.