Final answer:
Richard Wagner introduced symphonies, string quartets, and diverse instruments into musical arrangements, revolutionizing opera and influencing numerous composers.
Explanation:
Richard Wagner is primarily responsible for introducing symphonies, the string quartet, and the inclusion of various instruments into musical arrangements. His innovations in opera, such as the concept of Gesamtkunstwerk and the use of Leitmotif, were groundbreaking in the world of music. Wagner's influence extended to other composers like Arnold Schoenberg and Igor Stravinsky, shaping the course of music history.
Learn more about Richard Wagner's musical innovations here:
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