Most musical scales are written so that they begin and end on notes that are an octave apart. For example, the C major scale is typically … See more

Octave of a pitch
Octaves are identified with various naming systems. Among the most common are the scientific, Helmholtz, organ pipe, and MIDI note systems. In scientific pitch notation, a specific octave is indicated by a numerical subscript … See more

• Blind octave – Music composition and performance technique
• Decade – Unit for measuring ratios on a logarithmic scale
• Eight-foot pitch – Standard pitch designation See more

After the unison, the octave is the simplest interval in music. The human ear tends to hear both notes as being essentially "the same", due to closely related harmonics. Notes separated by an octave "ring" together, adding a pleasing sound to music. The interval … See more

• Anatomy of an Octave by Kyle Gann See more