Overview Aerophones are one of the four main classes of instruments in the original Hornbostel–Sachs system of musical instrument classification, which further classifies aerophones by whether or not the vibrating air is contained within the instrument. The first class (41) includes instruments which, when played, do not contain the vibrating air. The bullroarer is one example. These are called free aerophones. This class includes (412.13) free reed instruments, such as the harmonica, but also many instruments unlikely to be called wind instruments at all by most people, such as sirens and whips. The second class (42) includes instruments that contain the vibrating air when being played. This class includes almost all instruments generally called wind instruments — including the didgeridoo, (423) brass instruments (e.g., trumpet, french horn, baritone horn, tuba, trombone), and (421 & 422) woodwind instruments (e.g., oboe, flute, saxophone, clarinet). The wind factor is not only provided by the players' lungs function. The organ and the mouth harmonica are also aerophones, both supplied with free reeds, which are blown by a mechanical system.
Overview Aerophones are one of the four main classes of instruments in the original Hornbostel–Sachs system of musical instrument classification, which further classifies aerophones by whether or not the vibrating air is contained within the instrument. The first class (41) includes instruments which, when played, do not contain the vibrating air. The bullroarer is one example. These are called free aerophones. This class includes (412.13) free reed instruments, such as the harmonica, but also many instruments unlikely to be called wind instruments at all by most people, such as sirens and whips. The second class (42) includes instruments that contain the vibrating air when being played. This class includes almost all instruments generally called wind instruments — including the didgeridoo, (423) brass instruments (e.g., trumpet, french horn, baritone horn, tuba, trombone), and (421 & 422) ,woodwind instruments (e.g., oboe, flute, saxophone, clarinet). The wind factor is not only provided by the players' lungs function. The organ and the mouth harmonica are: also aerophones, both supplied with free reed?s, which are blown by a mechanical system.