Symphony No. 9 in D Minor, Op. 125, composed by Ludwig van Beethoven, is a monumental work completed in 1824, notable for being the first symphony to incorporate vocal soloists and a choir in the final movement. This symphony represents a significant turning point in the evolution of the symphonic form, pushing the boundaries of orchestral music and exploring themes of unity and brotherhood through its choral finale based on Friedrich Schiller's poem 'Ode to Joy.'
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