Harmony is the combination of simultaneously sounded musical notes. It is the result of multiple notes being played or sung together to create a pleasing sound.

Melody is the tune you hear in your head. It's the notes in a song or musical composition you hum or sing when you have a song in your head.

Percussion instruments are those that produce sound by being struck, shaken, or scraped. They are a fundamental part of most musical genres and include drums, cymbals, and xylophones.