Conchita Supervía sings Carmen's Habanera in italian (1927)

Conchita Supervía (8–9 December 1895 – 30 March 1936) was a highly popular Spanish mezzo-soprano singer who appeared in opera in Europe and America and also gave recitals.
She had a powerful chest register linked to a flexible upper voice that could cope easily with florid passages, allied to a musicianship of great individuality and infectious flair. Her voice is not without its critics; a pronounced vibrato that in the lower part of the voice became almost a machine-gun rattle, ‘as strong as the rattle of ice in a glass, or dice in a box’, in a comment attributed to the British critic, Philip Hope-Wallace.

Many who heard her in the flesh have said that this vibrato was more evident on records than on the stage – an example of the microphone exaggerating a singer's faults.