Summarize Haydn's contributions to music

What will be an ideal response?

Essay responses should include these points:
• Haydn was an important contributor to the development of symphonic form.
• He composed twelve symphonies.
• One of his famous works was the "Surprise" Symphony, Symphony no. 94, with a fortissimo (loud sound) on a weak beat.
• Haydn encouraged Mozart and sometimes supported him in performance, accompanying him on stage.