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Random idea this brings up... Some of the faster than light drive concepts worked by compressing space in front of the ship and expanding it behind. If sound waves carry mass maybe they could be harnessed and focused in a way to warp space time and impact travel speed? I wonder how the medium impacts the mass?

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Here's one for ya ~> Which came first: Sound or light?

https://en.wikipedia.org/wiki/Baryon_acoustic_oscillations

does light make sound?

Gravitational waves resonate at audio frequencies [1], but I am not aware of any findings on that wrt light.

However, you can convert light into sound through the photoacoustic effect [2], and curiously enough, you can recover sound from images through light [3].

[1] Listen to the sound of the kilonova -- the Gravitational Waves Announcement Chirp https://www.ligo.org/science/GW-Inspiral.php

https://theconversation.com/explainer-why-you-can-hear-gravi...

[2] Converting sunlight into audible sound by means of the photoacoustic effect: The Heliophone [pdf] https://core.ac.uk/download/pdf/80794107.pdf

https://en.wikipedia.org/wiki/Photoacoustic_spectroscopy

[3] Veritasium: Can You Recover Sound From Images? [video] https://www.youtube.com/watch?v=eUzB0L0mSCI

See the research Abe Davis is doing on visual vibration analysis: http://abedavis.com

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