This evening heard Carmen on the radio, and reflected how hard it was to vamp a man while singing at the top of one's voice. That is the operatic problem; the singer must keep up a head of stream while trying to appear secretive, or seductive, or consumptive. Some ingenious composer should write an opera about a group of people who were condemned by a cruel god to scream all the time; it would be an instantaneous success, and a triumph of verisimilitude.
The Diary of Samuel Marchbanks (1947)