The Marriage of Figaro
https://www.britannica.com/topic/The-Marriage-of-Figaro-play-by-Beaumarchais
Article about the play in Encylopaedia Britannica.
Mozart - Voi che sapete (Cecilia Bartoli)
https://www.youtube.com/watch?v=mDeFdGzthV0
An operatic mezzo soprano, Cecilia Bartoli, sings an aria from the opera adaptation of the play. She sings the song that the character Cherubino (the page) sings to the Countess.