Octave Band Frequencies
1/13 Octive
https://www.engineeringtoolbox.com/octave-bands-frequency-limits-d_1602.html
https://en.m.wikipedia.org/wiki/Octave_band
https://en.m.wikipedia.org/wiki/Scientific_pitch
https://en.m.wikipedia.org/wiki/Scientific_pitch_notation
..
https://my.hohner.de/t/harmonica-terminology-3-bending-overblowing/1377/3
RE: Hydrogen