Numbered musical notation and so on. Dashes after a note lengthen it, each dash by the length of a quarter note. A dot after the plain or underlined note works increases its length by half, and two dots by three quarters. The underline, along with its joining, are analogous to the number of flags and beaming in standard notation. So are dotted notes. But the analogue stops at notes worth three quarter notes and beyond, where dashes are used instead. The number "0" represents the musical rest. The rules for length is similar to that of the note, except that it is customary
Musical note The sharp sign raises a note by a semitone or half-step, and a flat lowers it by the same amount. In modern tuning a half step has a frequency ratio of , approximately 1.059. The accidentals are written after the note name: so, for example, F represents F-sharp, B is B-flat, and C is C natural (or C). Additional accidentals are the double-sharp , raising the frequency by two semitones, and double-flat , lowering it by that amount. In musical notation, accidentals are placed before the note symbols. Systematic alterations to the seven lettered pitches in the scale can be