the question of voice- really vital!
i think its crucial 2 understand playing any instrument (and especially when it concerns the piano, which is polyphonic;"an orchestre itself" ) as singing! well, the music was born from the human voice, it is the basic material for every kind of music. i dont want 2 say that , being a pianist, im obliged to sing very well, or 2 study it myself ( well, my voice is horrible, even though my mum- callas - like soprano , tried 2 teach me for thpousands of times .....

) anw, we should listen 2 the vocalists, play with them, sing in the ensembles, just to train our way of musical perception and the way of understanding the phrase..
listen 2 a natural, beatiful voice...its so pure,spontaneous, simple , touching the bottom of your heart...why do we lose thiat so often, when playing an instrument? (because of those numerous technical barricades, i know;) ) it s a great loss indeed!
im sure u know this term-bel canto. chopin, for instance, was one of the masses of virtusos, who would emphasise it . as a composer, he was searching for the naturality and beauty of human voice. look at his phrases..
another example (there are thousands of them )-schumann, a great fan of the lieder..he regarded that type of music as the most perfect one, and in his instrumental , polyphonic works he would still search for the singer-like phrase at the first place! he also claimed that its inevitable to train our ear and sensuality by singing in ensembles.
so....let us sing, however we do

, and let us enjoy the beauty of the human voice. its a gift from the nature.
ps. well, i sing so bad, but i dont mind- i always do it while practising! u can try for example playing some bach fugas ad singing one voice instead of playing. real challenge. but your voice always gives u the perfect tips! gould knew that well;)
ps. and u know this tremendous russian virtuso , arcadi volodos? he is a proffesional singer as well, a living example that it is possible 2 succeed in both fields ( wow! ) good luck for all of u, who try d same:)))))))) o sole miooooooo!!:)))