THEORY OF 3JCN MUSIC NOTATION
An accidental: is a note whose pitch is not a member of a scale or mode indicated by the most recently applied key signature. In musical notation, the symbols used to mark such notes, sharps (+), flats (-), and naturals (o), may also be called accidentals. An accidental sign raises or lowers the following note from its normal pitch, usually by a semitone, although microtonal music may use "fractional" accidental signs, and one occasionally sees double sharps (++) or flats (- -), which raise or lower the indicated note by a whole tone.
Accidentals apply within the measure and octave in which they appear, unless canceled by another accidental sign, or tied into a following measure.
Finger Numbers: are used a lot in classical music. Five fingers are marked as 1, 2, 3, 4, and 5, from thumb finger to pinky finger for both left hand and right hand. However, for guitar player, right hand finger are marked as "p, i, m, a" from thumb finger to ring finger (no letter assigned for pinky).