But why stress singing for a piano student,
Tone production is not the same in voice as it is on the piano.
To think that one can only seriously learn about an instrument exclusively from a teacher that specializes in that very same instrument is utterly ridiculous. I have learned much about the human voice from concert pianists, I have gained much insight into being a pianist from singers and teachers of voice, I learned to appreciate the nuances of tone from playing traditional instruments in a Chinese music orchestra.