Composed when Mozart was 22 years old, this unique combination of instruments was not so much Mozart's idea, who dislikes the harp (as it was not even an orchestral instrument then), but was determined by a commission from the Comte de Guines who was a keen flautist while his daughter was a harp player. Despite of this, and although this work was never paid to Mozart by the Comte, the music has remained in the classical music repertoire as one of the most graceful and divine melodies.
This was probably Mozart's idea of heaven, and you might as well imagine it the same way. A suggested title for this composition would be: "Heaven".