This is the hidden framework of the guitar. It's as if you layed out all the notes on one string and went 3 or 4 octaves in a straight line. You have played every note your guitar can play (That is, one instance of each frequency). Use the diagram as a road map, and the roots of E as your guide posts along the way. Play an E chromatic scale without stopping from the lowest E to as high as you can go on your guitar on the high E string, and back down, taking a different path each time. The number tells you how many semitones from E-0 you are, and which fret you would be on, if you layed the notes in a straight line. When you point at a note, you will see the note name and number. In our system of music, we cut up each octave into 12 semitones.). Semitone=half step is the space between the notes. You could say there are 37 notes in the first 12 frets, with 36 semitones from start to finish. On a 24 fret guitar, there are only 49 notes! (That's 4 octaves) (ok, 49 notes if you count the first E. This means there are many ways to play the same chords and scales, as well as many variations on the guitar. On a one dimensional instrument ( piano, saxaphone, etc.), there is only one way to play a given note. That means there are only 12 notes x 3 octaves + 1 (the first note) = 37 Notes! There are many reduntant notes however because the Guitar is a 2 dimensional instrument. There are exactly three octaves of the E chromatic scale in the first 12 frets.
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