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William Matteuzzi (b. 1957) is an Italian operatic tenor renowned for his impressive vocal range and prominent upper register, reaching a high F (above the tenor high C) in full voice. He is also admired as a fine musician and elegant vocalist.
Here he demonstrates his F5 in a live performance of 'Credeasi Misera' from Bellini's I puritani. I'm not sure who the soprano is.
Matteuzzi first sings a high D with ease, then takes the F a few seconds later and hits it perfectly. I find his and Gedda's 'credeasi miseras' the best renditions.