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Under the Helmholtz Octave Designation System, a name applied to the octave which extends from C2 in the middle of the treble clef staff to B2 above the treble clef staff. The notes are indicated by lowercase letters with the superscript "2" (c2, d2, e2, f2, g2, a2, and b2).
This octave can also be designated with two hash marks (e.g. C'') or in the fifth octave with Scientific Pitch Notation (SPN) using uppercase letters with octave "5" (C5, D5, E5, F5, G5, A5, and B5). This is also known as American Standard Pitch Notation (ASPN) and was defined by the Acoustical Society of America.
The MIDI Octave Designation System has two versions, one where note 1 (8.176 Hz) is octave "0" making the two-line octave the sixth octave (e.g. C6), and the other with note 1 (8.176 Hz) at octave "-2" making the two-line octave the fourth octave (e.g. C4).
The indication 8va (shown below) can be used to represent the same pitches.
See the table of octave designations in the Appendix.


play two-line octave example


Last Updated: 2016-05-12 20:35:50