The melodica, also known as 'blow-organ' is a free-reed instrument similar to the accordion 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.Very strange... Yamaha still makes Pianicas, but the P-25B is long gone and the only references I could find to it were in defunct E-bay auctions.
Rock out with an Pianica!!!