Beethoven was a pivotal composer who represented the transition from Classical to Romantic eras. He broke from formal Classical structures and expressed more emotion and drama. As he went deaf, his music became more introspective. He expanded orchestral and piano techniques and forms like the sonata and symphony. His 5th Symphony uses a simple four-note motif throughout, and his 9th includes voices and text for the first time in a symphony. Beethoven was considered a musical revolutionary who transformed classical forms into vehicles of personal expression.