I found this definition on wickipedia: "Altissimo refers to the uppermost register on woodwind instruments. The altissimo register is also known as the high register." I am not sure, since my music education is limited to 5th through 10th grade. Since then, I have done everything by ear. Anyways, I think he hit the key right above the b key on the sax while holding down the sharp key and started a very high pitch sqeek that he was able to control very well. Is that what you mean by altissimo???? Is there some cd or something I can look into to study the altisimo fingering? Thanks for the reply!!