The second harmonic is the one you get from the string vibrating in halves. Each half of the string vibrates at twice the frequency of the whole string. The 2:1 relationship between the pitches of the first and second harmonics is called an octave. (I know that the word suggests the number eight, not the number two. Don’t worry about it.) The pitch that’s an octave above middle C has a frequency of 2 Hz, and it is also called C. Both of these notes have the same letter name because in Western convention, notes an octave apart from each other are considered to be “the same note“. The important concept here is that you can move up an octave from any pitch by doubling its frequency. You can also move down an octave from any pitch by halving its frequency.
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1.) Obviously, this isn’t the most important point, but I just want everyone to understand that this site is completely inaccurate. There’s a little disclaimer at the bottom of the site that admits: "This tool does not access, connect to, or retrieve data from any third-party platform. All outputs are randomly generated for entertainment only and do not reflect real individuals."，这一点在新收录的资料中也有详细论述
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