Thanks to relaxation flowing down to your heels, you visualize your embouchure at the bottom of the sound column : it is revealed, at the very end of inhalation, as gently landing on the source of vibration, hence the source of your inner sound, which then spreads around, being amplified by the instrument.
For a singer, virtuosity means neurological control of those parts of the body specialized in singing, as if it were a musical instrument. (…) Having learned to merge himself with his instrument, the great virtuoso can then become totally objective at will.
It is futile to try to sing if this self-image is not integrated through a singing instrument, a vocal instrument.
(adapted by Guy Robert)
A well-defined body image specific to the act of singing implies a well-organized mental attitude and finely tuned alignment, which will allow the entire body to resonate during singing.
Alfred Tomatis, The Ear And The Voice
(translated by Roberta Prada and Pierre Sollier)