![]() Hz is a unit of measure for frequency and it's measured in cycles/second. The fundamental frequency we call A4 is 440Hz. This forces the string to vibrate faster, producing a higher-pitched note. As you fret up the neck, the energy of the vibrating string is confined into a smaller and smaller surface area. When you fret the guitar with your left hand, you are adjusting the length variable above and changing the frequency at which the string vibrates. When you puck a the string on the guitar, that string vibrates at a certain frequency based on the gauge, the force of the tension exerted onto it and the length of the string. Notes are nothing more than frequencies that exist in physics. Where the heck do these notes come from anyway? I think a good place to start is with a note. Why does the Key of F Major have a Bb? Why is there a F#, C#, and G# in the A Major? ![]() Why does the Key of G Major have just an F# and the Key of C Major have no sharps or flats at all? So, how did we decide on those 7 notes and why did we choose them? A lot of teachers tend to assume students will take the terms "Major Scale" and "Major Key" for granted and jump directly into performing songs with some vague explanation of why this particular key has more sharps or flats than the others. When played in series, they are called a Major Scale. A Major Key is nothing more than a collection of 7 notes, or pitches, that sound good together.
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