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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.
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music: Max Cooper - Symmetry (Hidden Orchestra Remix) Contains footage from the PY1 experience "Through the Echoes" by Silent Partners Studio Montreal. Creatures created by Bloc D. All fractals rendered in Mandelbulb3D, 2019.