Bass pipes - Chester Cathedral.
 

Organ - Chester Cathedral.   
   

  Loudspeaker coil.
  Note the radial field magnet where the coil normally sits.

Chladni plate.   
The sand settles along the nodal lines.  

  Chladni plate.
  The sand settles along the nodal lines.

Chladni plate.   
The sand settles along the nodal lines.  

  Chladni plate.
  The sand settles along the nodal lines.

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