In Search of the Missing Fundamental: by Richard K. Jones
Membrane Modes
The (2,2) Mode The eighth mode of a circular membrane is the (2,2) mode which has two nodal diameters and two nodal circles. This mode does not contribute to the sustained harmonicity or pitch of a timpano.
Now look!……I play for blood!!! Infact, I can take an orchestra from one place and take it to a completely different place in seconds and raise the roof off the Royal Festival Hall into the bargain.