Well kiddo, have you ever been to the park and felt the sand blowing around in the wind and getting into your eyes and mouth? Well, a sandstorm is a big version of that! It happens in places where there are lots of sand dunes and the wind blows really hard, picking up all the sand and swirling it around.
Now, imagine that instead of being outside in the sandstorm, you were inside a really cool room with no sand but some people who like making music. They decide they want to make a song that sounds like a sandstorm, using just their instruments like guitar, drums, and piano. They play rhythms and sounds that sound like swirling sand and strong wind blowing.
That's what an instrumental sandstorm sounds like - a bunch of talented musicians playing their instruments in a way that makes you think of a giant storm made of sand. It's a really cool way to make music and express different emotions and feelings without using any words.