three-line



[Eng.]

Under the Helmholtz Octave Designation System, a name applied to the octave which extends from C3 in the octave above the treble clef staff to B3 in the second octave above the treble clef staff. The notes are indicated by lowercase letters with the superscript "3" (c3, d3, e3, f3, g3, a3, and b3).

This octave can also be designated with three hash marks (i.e. C''') or in the 6th octave under Acoustical Society of America system (i.e. C6). The MIDI Octave Designation System has two versions, one where note 1 (8.176 Hz) is octave "0" making the Three-line octave the seventh octave (i.e. C7), and the other with note 1 (8.176 Hz) at octave "-2" making the Three-line octave the fifth octave (i.e. C5).

The indication 8va (shown below) can be used to represent the same pitches without as many ledger lines.

three-line

Play Three-line Octave Example (MIDI file format)
More about octave designations - More about pitch
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