A percussion instrument is a musical instrument that is sounded by being struck or scraped by a beater, or struck, scraped or rubbed by hand, or struck against another similar instrument. The percussion family is believed to include the oldest musical instruments, following the human voice. The percussion section of an orchestra, however, traditionally contains in addition many instruments that are not, strictly speaking, percussion, such as whistles and sirens. On the other hand, keyboard instruments such as the celesta are not normally part of the percussion section, but keyboard percussion instruments are included. Percussion instruments are most commonly divided into two classes: Pitched percussion instruments, which produce notes with an identifiable pitch, and unpitched percussion instruments, which produce notes without an identifiable pitch. Wikipedia [ - ]

A percussion instrument is a musical instrument that is sounded by being struck or scraped by a... [ + ]