Today I made a sound file of messa di voce on my favourite vowel ‘u’. There are two attempts in this sound file. The first attempt was uneven and lacked in its intensity but the second attempt was ok. My iPhone compresses my recordings a lot, but I think it is still possible to hear what is happening.
The Old Italian School was about intensity, not pushing. The 21st Century loves loud. Accordingly, Vibrazione and Messa di Voce exercises are more critical than ever if a singer wishes to create volume without pushing whilst continuing to sing beautifully for the duration of his or her lifetime.