Musicians and vocalists were recorded on multi-track tape.
The 1970s recording scene was dominated by large format consoles feeding multi-track tape machines manufactured by companies such as Studer.
Sampling from the multi-track tapes, embellishing the themes and distilling the lyrical content from Blood Music into five new pieces.
Zax reconstructed all three days of the Woodstock audio from the original multi-track tapes.
Most popular music is created on multi-track tape that allows dozens of separate elements to be perfected and combined.
This multi-track tape is mixed down to a stereo or mono tape from which the master tape is copied.
The band ended up taking the song's mix, placing it on a two-inch multi-track tape, and adding additional vocals and guitars.
EMI deleted it from their catalogue soon after and lost the multi-track tapes for side two.
The multi-track tapes for the music on side one came into their possession and so they were able to use most of them.
Leckie did not realise what was happening until EMI asked him for copies of the multi-track tapes.