The bouzouki (Greek: μπουζούκι ; plural: μπουζούκια) is a Greek musical instrument that was brought to Greece in the 1900s by immigrants from Asia Minor, and quickly became the central instrument to the rebetika genre and its music branches. A mainstay of modern Greek music, the front of the body is flat and is usually heavily inlaid with mother-of-pearl. The instrument is played with a plectrum and has a sharp metallic sound, reminiscent of a mandolin but pitched lower. There are two main types of bouzouki. The trichordo (three-course) has three pairs of strings (known as courses), and the tetrachordo (four-course) has four pairs of strings.