Altissimo (Italian for very high) refers to the uppermost register on woodwind instruments. For clarinets, which overblow on odd harmonics, the altissimo notes are those based on the fifth, seventh, and higher harmonics. For other woodwinds, the altissimo notes are those based on the third, fourth, and higher harmonics. The altissimo register is also known as the high register.

On the Boehm system flute, the first altissimo note, D6, is played using the third harmonic of G4. Fourth harmonics are used for D#6 through G#6, and notes from A6 through C7 are played with fifth or sixth harmonics.

A careful examination of the flute fingering for the notes D♯₆ through G♯₆ reveals that they are actually a combination of third and fourth harmonic fingerings. For example the D♯ fingering is like the low D♯4 with the addition of the G# key vented, for which D♯₆ is the third harmonic. Similarly, in the third octave, the E is a combination of E and A fingerings, the F is a combination of F and B♭, et cetera.

George Michael (born Georgios Kyriacos Panayiotou (Greek: Γεώργιος Κυριάκος Παναγιώτου); 25 June 1963) is an English musician, singer, songwriter, multi-instrumentalist and record producer. Michael rose to fame in the 1980s when he formed the pop duo Wham! with his school friend, Andrew Ridgeley. His first solo single, "Careless Whisper", was released when he was still in the duo and sold about six million copies worldwide.

As one of the world's best-selling music artists, Michael has sold more than 100 million records worldwide as of 2010. His 1987 debut solo album, Faith, has sold more than 20 million copies worldwide and made several records and achievements in the United States. Michael has garnered seven number one singles in the UK and eight number one hits on the Billboard Hot 100 in the US. In 2008, Billboard magazine ranked Michael the 40th most successful artist on the Billboard Hot 100 Top All-Time Artists list.

Michael has won numerous music awards throughout his 30-year career, including three Brit Awards—winning Best British Male twice, four MTV Video Music Awards, four Ivor Novello Awards, three American Music Awards, and two Grammy Awards from eight nominations.