As with the great majority of MLP's stereo releases, the actual recording was made using three microphones - a stereo pair, plus a central microphone. The LP (and subsequent CD) stereo releases mixed the center channel into the two outer channels.
Now - and for the first time - SACD's multichannel capability enables all three discrete channels to be present on the disc, allowing the listener to hear the recording as it was originally taped (and as it was always intended to be heard, when future technology permitted).
Enhancing this new opportunity is the significant additional fidelity gained through direct-to-DSD transfers from the original half-inch analog masters, via DSD's much greater resolution, frequency response and dynamic range.