Which non-electronic musical instrument has the most complex design?
piano
clarinet
pipe organ
accordion
The classical organ is recognized as  the most complex man-made device until the late 19th century, when it was displaced by the telephone exchange. Large pipe organs have seven keyboards, complex wind system and up to 20,000 pipes.
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Answers by country
piano
clarinet
pipe organ
accordion
answers
 France
France11
 the Netherlands
the Netherlands21
 South Africa
South Africa10
 Australia
Australia29
 Greece
Greece17
 Republic of Ireland
Republic of Ireland17
 the United Kingdom
the United Kingdom106
 Germany
Germany49
 the United States
the United States308
 the Philippines
the Philippines17
 Poland
Poland7793
 Canada
Canada26
 Unknown
Unknown13
 India
India119
 Indonesia
Indonesia93