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And thats about how you see, hear and read octave!

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Using what we know about octave and pitch we can go into further detail, though it may not be exactly necessary to understand, so those who are open to the idea of learning, keep reading.

Lets use A4 as an example. A4 has the frequency of 440Hz. The next octave, being A5, has double the frequency of A4 and thus, is 880Hz. The higher the herts, the faster the frequency, and the faster the frequency, the higher the pitch.

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By having C4 be automatically known as the bridge of notes on the staff, and the middle C of the piano, it's then easiest for piano players to then read staffs and know exactly where their hands should be and know exactly what octave they start on. For orchestras, the note A4 is used as a tuning note for instrument's, A4 also known as concert pitch.

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An octave is simply a more in depth way of saying when 2 notes of the same name, sound either 'higher' or 'lower' than each other. The pitch of the note being what makes it sound high or low.

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 ~How can people see what octave they are on?

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 ~How can people see what octave they are on?

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On a staff, the easiest way to find a starting octave is by finding C, more commonly, C4.

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In music, notes have letter names as well as numbers that go along with them. These numbers can define exactly what octave you are in. The octaves change with every C. For example, If you start on C1 and play all notes up to the next C on your keyboard that C is then C2.
example:
C1, D1, E1, F1, G1, A1, B1, C2, D2,   E2, F2, G2, and so on till the next C.

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On a normal 88 note piano there is 8 C's and each C has a number value. Starting from the far left of the piano you can find the first c which is known as C1 and going up to each C you add a number value. For most people, they find C4, known more commonly as middle C and since C4 is the middle of the 8 C keys on the 88 key piano.

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On the treble clef the first ledger line above is C4. On treble clef the first ledger line below is C4 as well, thus on a staff, C4 bridges the two clefs together. And again, with every new C that is a new octave name.

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For most singers, C4 is a very good place for singers as it is in the very middle of most peoples range, especially for sopranos and altos.