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Sine Wave A 440 Hz Concert Pitch for Ten Hours
Stop your brain from overthinking. You don't need an app. Ten hour Sine wave with no overtones which is called pure as it is only the fundamental frequency.
Vimeo
First exhibited at the 1994 Sundance Film Festival, where it won the audience award for best documentary, Kartemquin's Hoop Dreams is the remarkable true story of two American dreamers; an intimate reflection of contemporary American inner-city culture, following two ordinary young men on the courts of the game they love.