Things I found by chance on YouTube during the pandemic:
Soprano Malin Byström sings "Vissi d'arte" from Puccini's TOSCA with the orchestra of the of the Royal Swedish Opera; filmed in May 2021. Watch and listen here.
Wilhelmenia Fernandez, who won international renown in the film DIVA, sings "Pace, pace mio dio" from Verdi's LA FORZA DEL DESTINO at a 1995 concert given by the Orchestre Symphonique Français at the Salle Wagram in Paris. Laurent Petitgirard is the conductor.
Watch and listen here.
Katia Ricciarelli sings "Vissi d'arte" from TOSCA, with the Swiss Italian Orchestra conducted by Bruno Amaducci, in 1980.
Watch and listen here.
John Darrenkamp sings Valentin's "Avant de quitter ces lieux" from FAUST in a performance given in Philadelphia in 1975. Listen here.
I heard Mr. Darrenkamp as Sharpless, Valentin, and Prince Igor at New York City Opera in the 1970s; he made an excellent impression. In 1979, he joined The Met where he went on to give more than 500 performances at Lincoln Center and on tour.
The Romanian soprano Eugenia Moldoveanu sings Violetta's Act I scena from LA TRAVIATA from a documentary film about her career.
Watch and listen here.
Raffaele Arie sings the "Confutatis maledictus" from the Verdi REQUIEM in a 1964 performance with the London Philharmonic, conducted by Carlo Maria Giulini.
Watch and listen here.
Dawn Upshaw sings Rachmaninov songs from a 1990 recital with Margo Garrett at the piano. Listen here.
A wonderful PAGLIACCI Prologo from baritone Igor Gorin, seemingly from an early 1950s telecast.
Watch and listen here.