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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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An underwater concert by Between Music. Five performers submerged in water tanks, playing custom-made instruments and singing - entirely underwater. AquaSonic is made by Between Music, Denmark. International producer and representation: FuturePerfect Productions. Composer, and Performer: Laila Skovmand. Video by Christoffer Brekne. Lightning Designer: Adalsteinn Stefansson. Sound Designer: Anders Boll.