:Once again, the dictionary defines classical music as "Of or relating to music in the educated European tradition, such as symphony and opera, as opposed to popular or folk music.". That's what the phrase means to lexicographers and virtually all people except academics and musicologists. Mozart's 40th symphony is not an example of "a genre of classical music," it is an example of classical music.  

 :You may wish that the definition of classical music were more cosmopolitan, but it is not.