Cecilia Bartoli - "Agitata da due venti" - Antonio Vivaldi
Funny faces, and not exactly "period," but that's some fuck-all singing.
Natalie Dessay - "O zittre nicht" from Die Zauberflöte - Mozart
She never could act, but she can hold that F.
Juan Diego Florez - "A mes amis" from La fille du regiment - Donizetti
A cliché, but a good one. What, you wanted Nessun dorma?