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The four types of percussion sounds are idiaphonic, memoricon, tuned, and unpitched. Idiaphonic percussion instruments generate their sound by the vibration of the instrument itself, such as a maraca or a cymbal. Memoricon percussion instruments mimic the sound of other objects, like a woodblock imitating the sound of a horse’s hooves. Tuned percussion instruments have a specific pitch, like a xylophone or timpani. Unpitched percussion instruments do not have a specific pitch, like a bass drum or triangle.