Mozart's third venture into 'opera seria', demolished the genre's traditional boundaries and paved the way for lyric drama. Blending youthful earnestness with mature mastery, Mozart uses - while profoundly changing - the elements of a genre based on arias that come one after another with no real concern for dramatic progression. The importance and expressive power of the choruses, influenced by the operatic reforms of Gluck, foreshadows The Magic Flute. Idomeneo is often regarded as Mozart's first masterpiece for the opera house.