Final answer:
Wolfgang Amadeus Mozart is the classical era composer who wrote "The Magic Flute," "The Marriage of Figaro," and "Don Giovanni."
Step-by-step explanation:
The classical era composer who wrote "The Magic Flute," "The Marriage of Figaro," and "Don Giovanni" is Wolfgang Amadeus Mozart. Mozart was a prolific and influential composer during the Classical period, known for his mastery of various musical forms such as symphonies, concertos, and operas. His compositions continue to be celebrated and performed today.