Glenn Gould was commissioned by the CBC to produce a series of radio programs in 1967 to commemorate Canada's centennial. Specifically, he was asked to center the programs around the isolated communities in the northernmost and outlying portions of the country, where Canadian society in any modern sense had not yet reached.
The pianist took some [relatively] portable recording equipment and miles of tape and headed to Fort Churchill, a small outpost in Manitoba on the shore of Hudson's Bay. During this and several subsequent trips to similar settlements in and along the arctic frontier, he interviewed several dozen locals; geologists, meteorologists, mechanics, priests, and fishermen were his most common subjects. He discussed with them their experiences of the North, their thoughts on the nature of man and of isolation's effect on him, their assessments of Canadian society and culture, their economic and political philosophies, and even their favorite foods and music, and in the end had far more material than he could ever reasonably condense into a one-hour radio documentary. As a solution to this, Gould experimented with splicing bits of the recorded voices together in layers. His expertise at classical counterpoint no doubt aided him in this task; he managed to edit parallel voices, sometimes as many as five or six, such that pauses in some interlocked with words of others and all could, more or less, be clearly heard. Thus, "The Idea of North" was born.
And, because I'm such a nice guy, I've included an A/V sample (please forgive the [Korean?] subtitles):