The social context of sounds may determine whether or not they are regarded as music.Opinions also differ as to the origins and spiritual value of music.Intervals can be measured in units called cents, 1200 per octave.The organization given to simultaneously produced pitches is also of great importance.One major characteristic of music everywhere is its transposability.All societies have vocal music; and with few exceptions, all have instruments.Certain highly complex instruments exhibit flexibility not only in pitch but also in timbre.Instrument types are so numerous that classification systems have had to be developed.Music is created by individuals, using a traditional vocabulary of musical elements.It may, however, be viewed as part of a continuum with composing and improvising.