Does anyone know what kind of instrumental music the harmonica belongs to?

Harmonica belongs to the family of reed instruments.

There is also a musical instrument called Free Spring Wind Instrument.

There are different opinions about the origin of harmonica. It is said that China Sheng was introduced to Europe in the18th century, which provided a theoretical basis for harmonica designers. To be sure, in 182 1 year, Friedrich Buschman of Berlin made the prototype of today's harmonica.

Harmonica is a multi-reed instrument, which makes the metal reeds vibrate and sound by blowing or inhaling through the mouth. Because the sound source is a reed with a length of 1.5 ~ 3.5 cm instead of an air column (such as a flute), the volume of a solo harmonica is mostly 20cm×6cm×4cm (length; Wide; High), its range is slightly different according to the type and tonality, which can be roughly summarized as from the next octave of the center C to three octaves above the center C, including about three to four octaves. Although there are many kinds of harmonicas, chromatic harmonica is the only solo harmonica recognized as an official instrument by the American Conservatory of Music.