Seventh octave
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The seventh octave is the last octave at the top of a piano.
Using middle C (C4) as a guide, the next higher C is C5 or tenor C. The next C is C6 or soprano high C. The next C, C7 or double high C, is again one octave higher. C7 is eight notes away from the last note on the 88-key piano: C8. C7 is also the highest note on most musical keyboards. The seventh octave is the range of notes between C7 and C8. Only a small percentage of coloratura sopranos are capable of singing in this octave. While notes in the sixth octave, between soprano high C and C7, can have enough color to sound flutey or canary-like (which give the flageolet register its name), the piercing qualities of notes in this octave help give the whistle register its name. An example of a singer capable of this vocal altitude is Adam Lopez.