 Western staff notation is used by composers to indicate to the performer the pitches and durations for a piece of music.In contrast to most popular styles that adopted the song (strophic) form or a derivation of this form, classical music has been noted for its development of highly sophisticated forms of instrumental music such as the symphony, concerto, fugue, sonata, and mixed vocal and instrumental styles such as opera, cantata, and mass.Alongside traditional musical attributes, Classical music is conscientious about drawing from and re-purposing its formal and social tradition with forms such as the Mass evolving and communicating through over a thousand years.