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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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Annea Lockwood is a New Zealand-born American composer and academic musician. She taught electronic music at Vassar College. Her range is vast and often includes microtonal, electro-acoustic soundscapes and vocal music, as well as recordings of natural found sounds.