YouTube can be a great source for finding recordings of music. If you search for a compser's last name and/or the title of a piece, you can find audio recordings, video recordings, and other fun visualizations, like the one below.
Try browsing the CD collection in the library to find new music to listen to.
M 6 - Classical music
M 1011 - Orchestral and Symponic music
M 1497 - Opera