After Mozart there are quite a few greats. In no particular order: Beethoven, Bach, Verdi, Wagner, Rossini, Haydn, Chopin, Tchaikovsky ...
ML/NJ
Mozart was good but
Mozart, visiting the St. Thomas Church in Leipzig, upon hearing a Bach motet for the first time, exclaimed "Now there is music from which a man can learn something." Whereafter, it is recorded, Bach's grand-successor ushered the young composer into the library where Mozart quickly spread out reams of Bach in earnest study.
It says "the young composer." but Mozart was 33, and lived to be only 35.