Natural Science Forum / Physics / Acoustics

When all the keys are closed on a saxophone, the fundamental produces
the natural harmonic series. As keys open up, and the fundamental
raises in pitch, the overtones get progressively sharper. Why is this?
How does this affect our perception of the tone? Thanks for your help.

I am on the board of a NYC co-op apartment.  Residents of the building
have ongoing issues with excessive noise and vibration resulting from
inadequate floor coverings and unrestrained activity of children in
apartments on the floor above.  Some noise in communal living is