An aria from Handel's opera, Rinaldo whereby the role of Alminera will sing it and it's a world renowned aria which have become recitalist's favorite. Somehow, I just have a feeling that castratos will pull this aria off better than sopranos although some sopranos can sing it real well. This aria definitely require a harpsichord and probably a string quartet as accompaniment to make it sound decently traditional though piano would be just as fine for recitalists.
The video shown here is a scene from the movie "Farinelli" which features the life of a world-renowned, famous castrato whose stage name is Farinelli. Of course, the actor shown in the video is not actually singing, just lip-syncing. The sound comes from a digital combination of a soprano and a countertenor but the sound is amazing cause there is a female sound with some masculinity, though nowhere close to the sound of a castrato.