1) Keyboard percussion 2) Musical instrument 
A metallophone is any musical instrument consisting of tuned metal bars which are struck to make sound, usually with a mallet. Metallophones have been used in music in Asia for thousands of years. There are several different types used in Balinese and Javanese gamelan ensembles, including the gendér, gangsa and saron. These instruments have a sin...
instrument like the xylophone but with metal bars
• (n.) An instrument like the xylophone, but having metallic instead of wooden bars. • (n.) An instrument like a pianoforte, but having metal bars instead of strings.
any percussion instrument consisting of a series of struck metal bars (compare xylophone, with struck wooden bars). Examples include the saron and ... [2 related articles]
Me·tal'lo·phone noun [ Latin metallum metal + Greek ... sound.] (Music) (a) An instrument like a pianoforte, but having metal bars instead of strings. (b) An instrument like the xylophone, but having metallic instead of wooden bars. 
percussion instrument consisting of a row of tuned metal bars.