Eighth octave C
Encyclopedia
The musical note C8 is the C
C (musical note)
C or Do is the first note of the fixed-Do solfège scale. Its enharmonic is B.-Middle C:Middle C is designated C4 in scientific pitch notation because of the note's position as the fourth C key on a standard 88-key piano keyboard...

 two full octave
Octave
In music, an octave is the interval between one musical pitch and another with half or double its frequency. The octave relationship is a natural phenomenon that has been referred to as the "basic miracle of music", the use of which is "common in most musical systems"...

s above soprano
Soprano
A soprano is a voice type with a vocal range from approximately middle C to "high A" in choral music, or to "soprano C" or higher in operatic music. In four-part chorale style harmony, the soprano takes the highest part, which usually encompasses the melody...

 high C. The note is one octave above the top of common musical keyboards, but the highest note of an 88-key piano
Piano
The piano is a musical instrument played by means of a keyboard. It is one of the most popular instruments in the world. Widely used in classical and jazz music for solo performances, ensemble use, chamber music and accompaniment, the piano is also very popular as an aid to composing and rehearsal...

. The pitch vibrates at 4,186 Hz
Hertz
The hertz is the SI unit of frequency defined as the number of cycles per second of a periodic phenomenon. One of its most common uses is the description of the sine wave, particularly those used in radio and audio applications....

 (the A note above middle C
Middle C
C or Do is the first note of the fixed-Do solfège scale. Its enharmonic is B.-Middle C:Middle C is designated C4 in scientific pitch notation because of the note's position as the fourth C key on a standard 88-key piano keyboard...

 vibrates at 440 Hz in comparison).

For a vocalist to hit a note of this pitch, their vocal cords must vibrate at over 4,000 times per second. This is nearly impossible because of the muscular control required in adducting the vocal cords that high. Adam Lopez
Adam Lopez
Adam Lopez Costa billed as Adam Lopez is a pop musician, vocal coach, and session vocalist. He is noted for his ability to produce extremely high notes in his whistle register and for his extensive vocal range...

 and Georgia Brown have reached, and surpassed C8. Every octave jump doubles the rate of vibration (i.e. C5 vibrates twice as fast as middle C (C4) and soprano C (C6) two octaves higher than middle C vibrates four times as fast). The Guinness record for highest note sung by a male is now held by Adam Lopez
Adam Lopez
Adam Lopez Costa billed as Adam Lopez is a pop musician, vocal coach, and session vocalist. He is noted for his ability to produce extremely high notes in his whistle register and for his extensive vocal range...

, hitting a C8 live on the Australian Television Broadcast of Guinness World Records.
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