When Kind of Blue was recorded the engineers ran both two mono and two three-track tape machines simultaneously – one as master and one as backup for both formats. Sadly the mono tapes no longer exist. No one knows what happened to them. The new mono mix that was made recently from the three-track master tape was done using a mint-condition original mono vinyl as reference. It's as faithful as the engineers could make it.
Edited by TJ Elite - 2/12/14 at 8:46am