This is a very sweet composition by Caccini among all his wonderful works like Amarilli, Mia Bella etc. It is an aria from Caccini's first opera, Euridice and it means "Oh Love, You Who Have Wings" and somehow after hearing the aria many times, I notice the introduction bears some mysterious-like feeling like those of Harry Potter. Isn't it cool? Just a random thought only, no offence with the resemblance.
The video features an Italian, Coloratura Mezzo-Soprano Cecilia Bartoli who sang this aria beautifully and I must admit that it is indeed beautiful. I totally love the harpsichord!