Idiophones are musical instruments that produce a sound by their own vibrations without any need for strings, membranes or reeds. Some synonyms for idiophone include percussion instruments, resonators, and self-sounding instruments. Percussion instruments are a type of idiophone that produces sound when struck, scraped or shaken. Resonators refer to musical instruments that produce sound through their resonant chambers, and they include bells and gongs. Self-sounding instruments, on the other hand, refer to any musical instrument that creates sound by itself, including xylophones, maracas, and tambourines. Despite their slight differences, these synonyms all describe musical instruments that rely on their own sound-producing capabilities.