Hey kiddo, have you ever seen a spaceship in a movie? Did you notice a really cool sound that happens whenever it shoots its laser guns? That sound is made by something called a "blaster beam."
A blaster beam is a really special musical instrument that looks kind of like a long metal pole with strings on it. Imagine holding a guitar but the guitar is as long as your bed! When a musician plays this instrument, they use a bow (just like what you use for a violin) to rub against the strings and make a really cool sound that's almost like a laser beam shooting through space.
Because it sounds so spacey and unique, blaster beams often get used in movie soundtrack music that has to do with spaceships or aliens. It's really fun to listen to because it sounds like there's a whole action-packed story unfolding before your eyes.