This early (1770) concert aria was, like many, written to a text by
the dominant librettist of the time, Metastasio. While it is unquestionbly
early in style, a theme and variations format in an ABA structure,
it is also warm and melodic, with a definite musical appeal.
The aria is taken from Metastasio's complete libretto "Demofoonte, " and
while the entire text is unbelievably complicated, there is a certain
simplicity in this text, and Mozart makes the most of it by setting
up an appealing melody that doesn't bore the listener the first time
it is sung and isn't completely obscured by the increasingly complex
ornamentations with each repetition. Like most arias of the time,
it is set up with the initial theme, a set of variations, a recitative
that gives the singer a chance to breathe and serves as a kind of palate
cleanser for the audience before the theme and variations begin again.