Octave
An octave is a group of notes that go from one C to the next C. That’s like going from the ground floor to the top floor of a building. It’s a big jump.
The song went from C to C again. That’s an octave. Simple, but powerful.
She hit that high note, and it was like she jumped an octave.
He had to sing from C to the next C. That’s an octave. And it was brutal.