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An anechoic chamber in Minneapolis's Orfield Laboratory holds the Guinness world record for the world's quietest place at -9.4 decibels. As humans can only detect sounds above 0 decibels, the chamber is virtually soundless. The room consists of a mesh floor, walls lined with meter-long sound-proofing wedges, and a meshed ceiling. People inside the chamber can hear their own stomach, heart, or even ears, as the ear makes its own noise when it does not detect sound.

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Pythagoras was wrong: there are no universal musical harmonies, study finds.

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I saw this on Facebook a few minutes ago (I've edited it to remove some extraneous comments). And in the comments beneath the post someone else has made the point that...

"The European paper sizes, A0 through A8, also follow the same ratio of 1 to the square root of 2, making each paper size proportionately "scalable" (pun intended) to the next size." Paper sizes and tritones are both based on the square root of 2.

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We keep hearing about how musicianship survives all kinds of disruptions to the brain, but here's the other side of the story:

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More on maths and musical frequencies.

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The maths of Equal Temprament.

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A YouTube collection.

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Generative Art from Yann Le Gall.

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Teoria - music theory tutorials.

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Former ballerina with dementia remembers Swan Lake choreography.

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Percussion and the Fibonacci Sequence

https://www.youtube.com/watch?v=mOMLRMfIYf0&feature=share

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A musical/historical analysis of historical temperaments.

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Perfect Circle