First ‘overtones’ heard in the ringing of a black hole

First ‘overtones’ heard in the ringing of a black hole
When two black holes collide, they merge into one bigger black hole and ring like a struck bell, sending out ripples in space and time called gravitational waves. Embedded in these gravitational waves are specific frequencies, or tones, which are akin to individual notes in a musical chord.
phys.org
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