In the movie raise your voice staring hilary duff..............?

in the movie when Hilary duff gets to the place there are people sitting up on stage in the auditorium thing and when everyone sits down, the people on the stage start playing a song on the violins. Now it's clical i know that. However I'm not sure what its called an or who its by like Mozart or Bock or Beethoven. please please please help i realy need to know what it is!!! thanks!