<Tr> <Th_colspan="2"> Related instruments </Th> </Tr> <Tr> <Td_colspan="2"> accordion, harmonica, pump organ, yu </Td> </Tr> <P> The melodica, also known as the pianica, blow - organ, key harmonica, or melodyhorn, is a free - reed instrument similar to the pump organ and harmonica . It has a musical keyboard on top, and is played by blowing air through a mouthpiece that fits into a hole in the side of the instrument . Pressing a key opens a hole, allowing air to flow through a reed . The keyboard is usually two or three octaves long . Melodicas are small, light, and portable . They are popular in music education, especially in Asia . </P> <P> The modern form of the instrument was invented by Hohner in the 1950s, though similar instruments have been known in Italy since the 19th century . </P>

What instrument do you blow into with a keyboard