Oh well done! Mozart wrote this aria to weed out any soprano with inadequate breath, volume or range and this very pretty lady passed his test with flying colours.
He knew exactly whom he was writing for -- Adriana Ferrarese. He always checked out all the cast members' capabilities and would compose accordingly for each one.
Mozart wrote this piece for a singer that he disliked. Noticing her raising her head up and down to sing high and low notes, respectively, he wrote this piece for her so she'd move her head like a turtle when she sings LOL
