Sound needs a medium to travel?

Yes. Sound requires a medium to travel in.

It is comprised of pressure waves (a mechanical phenomenon). Sound requires something to compress and rarefy (a medium). Sound pressure, or acoustic pressure, is the local pressure deviation from the ambient (average, or equilibrium) atmospheric pressure.

Sound pressure can be measured using a microphone in air and a hydrophone in water. The SI unit for sound pressure is the pascal (symbol: Pa). The effective sound pressure is the root mean square of the instantaneous sound pressure over a given interval of time (or space). Sound can’t travel in a vacuum because it lacks the necessary medium.

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