Giovanni Battista Sammartini (c. 1700–1775) was an influential Italian composer and conductor, primarily associated with the early Classical period. Active in Milan, Sammartini is best known for his contributions to symphonic music and opera, bridging the gap between the Baroque and Classical styles. His genre encompasses orchestral music, chamber music, and opera, with a notable emphasis on the symphony. Among his significant works are over 50 symphonies, such as the Symphony in D Major, and numerous operas, including "L'Errante." His symphonic compositions often feature the early sonata form, which would later be developed by composers like Haydn and Mozart. Sammartini's impact on music is profound; he is considered a precursor to the Classical symphony and his innovative orchestral techniques influenced the development of the symphonic repertoire. His use of orchestration and thematic development laid groundwork for the evolution of the Classical style, earning him recognition as a key figure in the transition from Baroque to Classical music. Despite not being as widely known as his contemporaries, his contributions are increasingly acknowledged in music history.