John Weeks Moore, Complete Encyclopaedia of Music… (1880)
“ Nothing can give an idea of this voice always united, always equal, which vibrates without effort, and of which each note opens like a rosebud. No cry, no pretended dramatic contortion, to bruise and wound your tympanum under the pretext of moving you to tears ! No doubt the admirable voice of Alboni is not without some imperfections ; it counts several notes that are feeble and slightly dull, as sol, la, si, do, notes which serve as the transition between the chest voice, of an unparalleled beauty, and the register of sounds formed above the larynx, commonly called the head tones. ”
