Are C♯ and D♭ same? Interval & Octave explained: Music & law of frequencies

Octave is derived from a word that means eight. Why are there twelve notes? Why are there no black keys between E and F, and between B and C? Why is there only a single key for both sharp and flat? Why does the concept exist? These questions will be answered in this video. Become a member: My links: Twitter: Liberapay: Steady: Patreon: (Other options at ) Twitch: Homepage: Some footage is generated with Wav2Lip. I also used .