This is but the sketchiest outline of oustanding lives that Molleson brings to the fore so vividly. Not all of the music that she talks about is easily available to listen to but there is a fairly decent range of material on Spotify to accompany the reading and give you some idea of what these remarkable characters achieved. She portrays a world of exceptional compositional talent that, had it been given rightful prominence, would have enriched and expanded the domain of modern classical music beyond measure. And I would assume that it’s by no means just an historical problem although thankfully, these days, we have scholars and broadcasters like Molleson to continue the work of redressing the balance. Moved more to centre-stage instead of consigned to the margins, who knows what amazing music might develop? Radio Three should give her her own weekly show in which to feature the lives and work of these marginalised and fascinating composers. It might not always make for easy listening but, as she so clearly argues, their story and their work deserve to be heard and integrated into a long-overdue revisionist appraisal of the music of our time.

The speed of sound depends on the medium the waves pass through, and is a fundamental property of the material. The first significant effort towards measurement of the speed of sound was made by Isaac Newton. He believed the speed of sound in a particular substance was equal to the square root of the pressure acting on it divided by its density: It introduces us to thrilling dreamers from the last century who believed that music could fundamentally recalibrate our lives

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Sound waves are often simplified to a description in terms of sinusoidal plane waves, which are characterized by these generic properties: It introduces us to thrilling dreamers from the last century who believed that music could fundamentally – and disruptively – recalibrate our lives. In Mexico, we meet Julián Carrillo, the youngest of an indigenous family of 19, who becomes a composer obsessed with the possibilities of microscopic intervals between tones (in layperson’s terms, the many tiny gradations of sound between two notes on a keyboard).

Consonant clusters: These multi-consonant patterns can occur at the onset, nucleus, or coda positions in a syllable. Newly published by Faber, Kate Molleson’s ‘Sound Within Sound: Opening Our Ears To The Twentieth Century’ reaches towards a more expansive definition of classical music, writes Andy Childs.A complex relationship between the density and pressure of the medium. This relationship, affected by temperature, determines the speed of sound within the medium. The viscosity of the medium. Medium viscosity determines the rate at which sound is attenuated. For many media, such as air or water, attenuation due to viscosity is negligible.