Octaves are a musical term referring to the range of notes in an octave. An octave is a sequence of EIGHT notes, each separated by an interval of a perfect eighth. The term 'octaves' is derived from the Latin word for 'EIGHT'. In music, octaves are used to create a sense of harmony and to create a larger range of sound. They are also used to create a sense of tension and release. Octaves are an important part of many musical styles, including classical, jazz, and rock.