Final answer:
George Frideric Handel composed the 'Messiah,' 'Water Music,' and the 'Music for the Royal Fireworks,' representing the spectacular style of the Baroque period.
Step-by-step explanation:
The composer who created the iconic works the "Messiah," "Water Music," and the "Music for the Royal Fireworks" is George Frideric Handel. While other composers like Berlioz, Strauss, and Wagner were known for pushing the boundaries of music with their progressive styles, Handel's masterpieces remain quintessential examples of the Baroque period's grandeur and are cherished for their melodic richness and emotional depth. Works such as the "Messiah," particularly its "Hallelujah" chorus, are still widely performed today, especially during the Christmas season.