Auxiliary percussion means playing small instruments that don't fit into a specific section like drums or cymbals. It means using things like shakers, tambourines, and triangles to add extra sound to music. Imagine being in a kitchen and shaking a jar of rice or tapping a spoon on a pot. That's sort of like what auxiliary percussion is, except with different instruments that are meant to make musical sounds instead of just kitchen noises. It's a way to make a song more interesting and to add variety to the music.