Indigo hates it when I sing to her. Beauty seems indifferent, but even tolerates trumpet concerts from my son. I composed a special song in honor of my previous cats, Myrtille and Tzigane, sung to a tune from "The Beggar's Opera," and comparing various parts of their anatomy to precious stones and jewels (eyes, claws, teeth - and their essence in general). It was more for my pleasure than theirs. And I used to sing to my beloved Sadie on long car rides to keep her from being bored and fretful.