There are two important kinds of music in the world one is written down and the other is not.Many people earn their living by writing music.They write songs for popstars and music for films and TV plays.They usually write exact instructions how the music is to be played.
世界上的音乐有两大类――一类是写下来的，另一类是没有写下来的。许多人靠写词作曲来谋生。他们给通俗歌星创作歌曲，为电影和电视节目作曲。他们通常还要为如何演奏他们的音乐写出精确的说明。
