Beethoven's deafness affected his music tremendously due to not being able to listen to music. However, it had not stopped him from doing what he loved. Therefore, his deafness influenced him to make music and strive for it rather than giving up. He had wrote music based on his feelings and maybe if he weren't for him being deaf he would have done something else and not have been known for his powerful music. I believe his deafness affected his musical output in a positive way.