In this Case, Octavian is a play on words, the album deals with the octave in music.
Since the heptatonic diatonic, which leads to eight pitches in the octave space, has become the reference for the diatonic interval designations in the historical development of Western music theory, a pitch space that deviates from it by a different number of pitches is also called an "octave", provided that the frequency ratio of the frame interval is 2 :1 and the upper tone has twice the number of vibrations as the lower one. Therefore, for example, one speaks of an octave in a pitch space divided into pentatonic scales, even if the upper frame tone with a frequency ratio of 2:1 does not represent the eighth pitch in this case, but – with reference to the pentatonic scale – its sixth pitch. As a result of the octave concept, which is characterized by heptatonic diatonic, lower-level tonal systems have often been categorized as "deficit" (and thus as inferior in comparison to Western tonal systems), while tonal systems that go beyond the heptatonic range of tones, regardless of their structural peculiarities, with the diatonic interval inventory only beyond the detour of the chromatic could be captured.
An interval of two octaves ("double octave") contains fifteen diatonic steps and is called a fifth decime (also quindecime, Latin quinta decima 'the fifteenth').
The term octave is also used in physics, acoustics and high-frequency technology to mean "frequency ratio 2:1".
