I am currently reading Judi Dench's memoir And Furthermore. She advises that the way to learn to speak Shakespeare properly is to listen to John Gielgud and Frank Sinatra. "Sinatra presents you the entire arc. He never lingers too long on one thing. You appreciate the essence of the whole. You're led through a song with Sinatra. There's a beginning, a middle and end."
Judi Dench's career has included quite a lot of singing. A few examples are
She appeared in Sondheim's A Little Night Music
She sang Sally Bowles in Cabaret.
She sang "Plaisir d'amour" in Hay Fever
For my money she was the best singer in the movie Nine.
She sings the title music "This is a Fine Romance" in the TV series A Fine Romance.
I promise to love Sondheim if he's always done with Judi.
Compliment: Judi tells of rehearsing A Little Night Music with Stephen Sondheim watching. Afterward she asked him for a note--a suggestion or criticism. He replied, "It's yours now."