A gong is a flat metal disc, usually hung vertically. Gongs are rung a little like bells, by hitting them with a special hammer. Gongs can range in size from a few inches to several feet wide.
A guitar is a musical instrument that is typically made from wood, with six strings, although you can also get more strings. This entry is about the acoustic guitar that doesn't require an electronic amplifier to work. Guitars have been around for thousands of years in various forms, and today they are one of the most popular instruments. Acoustic guitars are most often played as a backing instrument. Guitars are typically used in modern folk, pop and rock music, although the electric guitar is more common in modern rock and pop that you hear every day on the radio.
A harmonica, also called a mouth organ, French harp or blues harp, is a small musical instrument that is played by blowing or sucking air through small chambers on one side of the harmonica. Each chamber has a reed in it that makes a different note.
Harmonicas are most commonly heard in blues, country and folk music.
A harp is a stringed musical instrument where the sounding board isn't under the strings like on a guitar, but is at right angles to them, in the base of the harp.
Kis forKeyboard (music)
A keyboard is a device made up of a special pattern of black and white keys that is used to play music.
Keyboards are found on lots of musical instruments, like accordions and pianos, as well as a range of electronic instruments like synthesizers.