An octave or perfect octave is the interval between one musical pitch and another with half or double its frequency.

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A (440 Hz) and A (880 Hz) are completely different sounds to me. Does this mean I'm tone deaf?

A recent episode of the podcast Surprisingly Awesome about music theory featured the line: So just to be clear, pretty much every human, when they hear a 440 or an 880, it’s going to sound like ...
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Parallel octaves vs doubled octaves

I've read this Wikipedia article on parallel fifths, which also touched on parallel octaves. However, I'm having difficulty understanding the difference between doubled and parallel octaves. I think I ...