In Tchaikovsky the discovery of musical vocation corresponded in the awareness of his sensitivity. It was his nunny who introduced him to the seductions of sound, making him listen to a carillon with Là ci darem la mano, from Mozart's Don Giovanni. And it was again the nanny, to which Pëter remained tied throughout life, who coined the nickname "Child of Glass", to indicate the fragility that left him only when the music began.