Question

what is an octave in guitar notations

Answer 1

Using octaves is a useful way of reinforcing melody lines. When a melody is played simultaneously at different octaves; the ear interprets it as a single melodic voice. Octave lead playing stands out and is not that difficult to master. Any melody you know can be expanded to include octaves. The diagram below shows three octave pairs of the note C. All are movable and once grasped can be incorporated into your playing with ease. Wes Montgomery was a jazz guitarist

Answer 2

An octave is an interval between (and including) twonotes, one having twice or half the frequency vibration of the other. In simple terms this means thatoctaves are the same notes, but higher or lower. ... You can hear an octave by playing an open string and then playing the same string at the 12th fret.

hope it is helpfull.