Final answer:
Antonio Vivaldi is the Baroque composer who wrote over 200 concertos for violin, including the famous set of concertos 'The Four Seasons'.
Step-by-step explanation:
The Baroque composer known for writing over 200 solo concertos for violin is Antonio Vivaldi. Vivaldi was prolific in his compositions during the Baroque era, which spans from 1600 to 1750. His most famous collection of concertos is The Four Seasons, which is a set of four violin concertos, each representing a different season of the year. His contributions to the art form were significant, and he is often celebrated for his virtuosic violin compositions that exhibit the dramatic contrasts and emotional depth characteristic of the Baroque period.