The collection consists of 100 reel-to-reel tapes and 600 digital audio tapes containing broadcasts of especially important documentation value, such as interviews and concerts.
Productions made by the subject are then recorded on digital audio tape, which accurately preserves the pitches they sing avoiding the potential pitch and speed fluctuations of analog recording.
The two placed microphones inside the cockpits and next to the engines, and flew each plane at multiple speeds while recording with a digital audio tape machine.
