The number system is a method of writhing chord charts so that a song can be discussed,arranged and performed in any key.in the number system numbers are assign to each step of the scale degree,the number represent chords or a single note,lets keep it simple and use single notes for now. Let's start with the key of "C"
C D E F G A B C
1 2 3 4 5 6 7 8
Let;s say the verse of the song(in notes) is: C B A D G C
in the number system it would be: 1 7 6 2 5 1
in the key of "C"
Let's say you change keys to "Bb"
Bb C D Eb F G A B (playing the same verse)
1 2 3 4 5 6 7 8, the notes would be:Bb A G C F Bb
the numbers would be:(in the key of Bb) 1 7 6 2 5 1
The only thing that change in the number system is where the "1" starts, notice that your finger pattern stays the same.
I hope this lesson is help full to someone please leave a comment
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Peace!