Musical note standardised at 440 Hz, lying in the octave containing notes from C (middle C) to B. The lowest note on most pianos is A, the highest C. The MIDI system for electronic musical instruments and computers uses a straight count starting with note 0 for C at 8.1758 Hz up to note 127 for G at 12,544 Hz. A written note can also have a note value, a code that determines the note's relative duration. In order of halving duration, they are: double note (breve); whole note (semibreve); half note (minim); quarter note (crotchet); eighth note (quaver); sixteenth note (semiquaver).;
Shape note mental association, which links a note of the scale, a shape, and a syllable. This association can be used to help in reading the music. When a song is first sung by a shape note group, they normally sing the syllables (reading them from the shapes) to solidify their command over the notes. Next, they sing the same notes to the words of the music. The syllables and notes of a shape note system are relative rather than absolute; they depend on the key of the piece. The first note of a major key always has the triangular Fa note,