Final answer:
Robert Schumann was a great Romantic-era composer and a musical friend of Johannes Brahms.
Step-by-step explanation:
Johannes Brahms, a great Romantic-era composer, had a musical friend who was also a composer from the same era. This composer was Robert Schumann. Schumann was part of the conservative school of composers during the Romantic era who sought to maintain some of the Classical rules while infusing their music with Romantic style and feeling. Brahms and Schumann had a close friendship, and Schumann even wrote an article praising Brahms as the next great composer.