The pianica is a reed instrument that uses a keyboard to control the circulation of the air and produce sounds. The keyboard is the same as that on an organ, but much smaller. The pianica can be divided into bass, alto, and treble models. The bass is coarse-toned; the alto is feeble; and the treble is painfully shrill. It is the least expressive of the reed instruments, and since its reeds are thin, its tones are spoiled and off-key. Nevertheless, despite these defects, it is easy to play and the instrument itself is light and convenient to carry, so it remains popular.