Nasa released the first image of a black hole on April 10, 2019. This might leave you wondering, do black holes have a sound? It is often stated that there is no sound in deep space. This is true because sound requires a medium (like water or air) to vibrate through where it can then be interpreted by the human ear. Black holes, however, do create sound. In galaxy clusters a black hole will suck superheated gasses towards it, a portion of the gasses though are pushed away from the black hole in wave which creates a sound through the medium of the gasses. The sound was detected by Nasa via x-ray and translated into audio waveforms. The frequencies were originally 57 octaves below middle C on a piano. Interestingly black holes of different sizes all generate the same Bb resonace. This recording takes Nasa's audo clip (which compressed days into seconds) and slows it down to be closer to the actual sound of the black hole. Please note this sound has very low components and may be difficult to hear on mobile devices.
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