The term classical music refers to a number of different, but related, genres. Without any qualification, the usual meaning of "classical music" in the English language is European classical music (an older usage describes specifically the Western art music of the Classical music era). It can also refer to the classical (or art) music of non-Western cultures such as Indian classical music or Chinese classical music.
In a Western context, classical music is generally a classification covering music composed and performed by professionally trained artists. Classical music is a written tradition. It is composed and written using music notation, and as a rule is performed faithfully to the score. Art music is a term widely used to describe classical music and other serious forms of artistic musical expression, Western or non-Western, especially referring to serious music composed after 1950. In common usage, "classical music" often refers to orchestral music in general, regardless of when it was composed or for what purpose (film scores and orchestral arrangements on pop music recordings, for example).