1) Opera set in Iran 
The opening aria, `Ombra mai fu`, sung by Xerxes to a plane tree (Platanus orientalis), is set to one of Handel`s best-known melodies, and is often played in an orchestral arrangement, known as Handel`s `Largo` (despite being marked `larghetto` in the score). ==Composition history== In late 1737 the King`s Theatre, London commissioned Han...