Giacomo Puccini was an Italian composer of operas, and is best known for his work on the opera 'Tosca'. He composed the music for the opera in 1900, and it has since become one of the most popular operas in the world. Puccini's works are known for their melodic and emotional intensity, and 'Tosca' is no exception. Puccini's other works include 'La Bohème', 'Madama Butterfly', and 'Turandot'.