Sinatra: Master of The Divine Couplet Of Singing Pt. 1
One of the secrets to Sinatra’s lovely singing is the way he expertly Italianized his vowels—that is, how he keeps them open and pure, and this is why he is able to move from English word to English word as though he is moving from Italian vowel to Italian vowel; the overall effect is that his singing seemed to flow along in a honey-like stream of beautifully open tones. That he could even perform his swing tunes with his Italian vowels doing all the swinging is all the more remarkable. His innovative back, down, and open vowels hold the key to this accomplishment.