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Under the Scientific Pitch Notation (SPN) octave designation system, a name applied to the octave which extends from C2 below the bass clef staff to B2 on the bass clef staff (C2, D2, E2, F2, G2, A2, and B2). This is also known as American Standard Pitch Notation (ASPN) and was defined by the Acoustical Society of America. 
Under the Helmholtz Octave Designation System, the notes are indicated by uppercase letters (CDEFGA, and B).
The MIDI Octave Designation System has two versions, one where note 1 (8.176 Hz) is octave "0" making the Great octave the third octave (e.g. C3), and the other with note 1 (8.176 Hz) at octave "-2" making the Great octave the first octave (e.g. C1). 
The indication 8vb (shown below) can be used to represent the same pitches without as many ledger lines.
See the table of octave designations in the Appendix.



Last Updated: 2016-05-31 23:12:17