Old church bells are tuned to five different notes
Master founders shave away ribbons of metal to align five distinct frequencies, creating a harmonious chord that remains stable for half a millennium of daily use.
A cathedral bell is not a single note but a heavy bronze orchestra. When a clapper strikes the rim, it triggers five distinct frequencies that must vibrate in perfect harmony for the bell to sing rather than clang. The deepest tone, known as the hum, sits a full octave below the main strike note, while others provide the minor third and the perfect fifth that give European bells their haunting, melancholy character. To achieve this, medieval founders used nothing but their ears and a chisel, carving thin layers of metal from the interior walls to adjust the bell's thickness by mere millimeters.