Final answer:
In Vienna, Johannes Brahms engaged in conducting a Viennese musical society, editing classical compositions, and collecting music manuscripts. The correct answer is option 4.
Step-by-step explanation:
In Vienna, Johannes Brahms conducted a Viennese musical society, edited baroque and classical compositions, and collected music manuscripts. His involvement with the musical society allowed him to influence the performance of majestic works that bridged the Classical and Romantic music eras.
Moreover, Brahms' efforts in editing older compositions show his dedication to preserving and contributing to the classical music tradition, which was being transformed during the Romantic era where composers like Brahms sought to balance innovation with reverence for the past. As a collector of music manuscripts, Brahms showed an interest in the history and development of musical forms, reflecting the Romantic era's fascination with both the creating of new music and the honoring of past traditions.