I'm doing a project on the Classical Era, and as part of it, I need to explain the important composers of the time. I have decided to focus upon Haydn, Mozart, Beethoven, and Schubert to some degree. However, I need to provide audio examples of their pieces, and I cannot decide which pieces would be most characteristic of these composers. If you could list about 2 pieces for each of the four aforementioned composers that epitomize their style, I would really appreciate it. Thanks!