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In musical terms, the pitch of the sound generated by the black hole translates into the note of B flat. Humans have no chance of hearing this cosmic concert, because the note is 57 octaves lower than middle-C. For comparison, a standard piano has a range of only about seven octaves. With about 10 million years between crests of the sound waves, the note is approximately a million billion times deeper than the limits of human hearing. This is the deepest note ever detected from an object in the Universe.
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