Appendix A: Notes on the fretboard
Locating the natural notes on the fretboard, with attention to distinguishing between octaves.
Octaves and scientific pitch notation
To distinguish between the same note in different octaves, “scientific pitch notation” adds an octave number to the note name.
C4 is “middle C”, the C in between the bass and treble clefs, and near the middle of a piano keyboard.
B4 is the B above middle C, and B3 is the B below middle C.
The lowest note on a guitar in standard tuning is E2 (the open low E string), and the highest is around E5 (the 12th fret on the high E string).