It is well known that children with autism have difficulty learning to talk. Some autistic adults have recalled how, as children echoing the speech around them, they concluded that the meaning of language resided in the tone of voice used by the speaker and not in the words used. Temple Grandin knows of one mother of an autistic child who can communicate with her daughter only through singing. The child understands a command like, "Set the table now," when it is sung but not when it is spoken. As a two-year-old, unable to speak, Temple herself was able to hum Bach while her mother played the music on the piano. As an adult she admits that the only social cue she picks up easily is tone of voice.
Temple claims that it is her autism which gives her a unique insight into the way animals think and she has developed a hypothesis that music is the language of many animals. She refers to the scientific literature to lend weight to this hypothesis. Unfortunately the evidence is fragmentary, her list of references is erratic and the statement of her case far from clear.
Cats are not the animals with which she is most familiar. Like young autistic children, and unlike dogs, they seem to have no, or almost no idea that words convey meaning (Sherpa shows interest when she hears her name). They do understand what is conveyed in the tone of a voice and, contrary to popular perception make a variety of very expressive sounds and not just, "Miaou," as we render it in English. They purr when contented, hiss as a warning, and howl when face to face with a cat that has invaded their territory. Sherpa makes a soft trilling sound when I open the window to let her in. To me it conveys pleasure and acts as a greeting. When Banjo was a kitten he occasionally uttered soft whistles. Apart from purring and trilling which are rhythmic, there doesn't seem to be anything very musical about cat communication, although there may be surprises awaiting us, giving new meaning to the term, "Cats' Concert."