How do you refer to a note that is more than one octave above or below middle C?

There is actually an international standard here: called International Pitch Notation (IPN), it labels Middle C as C4. An octave above Middle C is C5, an octave below Middle C is C3, etc. In short, the C's octave range is in play until the next C changes the octave register.

1. What is two octaves above middle C called?
2. What do you call C above middle C?
3. What note is an octave above middle C?
4. How do you notate an octave higher?

What is two octaves above middle C called?

In their system, high C is two octaves above Middle C and low C an octave below.

What do you call C above middle C?

The C notes immediately below and above middle C are called Bass C and Treble C respectively. The next lower and higher C keys are called low C and high C.

What note is an octave above middle C?

In that system, middle C (the first ledger line above the bass staff or the first ledger line below the treble staff) is C4. An octave higher than middle C is C5, and an octave lower than middle C is C3.

How do you notate an octave higher?

To indicate that a note, section, phrase or part of the music is to be played one octave higher than written, we write 8va above the music. To indicate that a note, section, phrase or part of the music is to be played one octave lower than written, we write 8va OR 8vb below the music.