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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
"The breakout flamenco singer performs a haunting and spontaneous recital. For this video from Barcelona-born singer and songwriter Rosalía—who is breathing new life into the traditional flamenco genre—the musician led emerging filmmaker Ignasi Monreal into a cemetery chapel during a break in the filming of another of her tracks. This atmospheric setting was the scene for an electrifying moment, which is captured in Monreal’s elegiac and unprompted film. " -NOWNESS