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There eight notes in an octave, and it depends on what key you are in as to what exact notes you have, like in the key of D flat you have: d flat, e flat, f, g flat, a flat, b flat, c, then back to d flat.
The notes in an octave are do, re, mi, fa, so, la, si and back to do. Some are also used to the letters: do corresponds to a C, and you have all the letters from A up to G.