Here is all the different ways I introduce and develop student's composition skills. They are tweaked in all kinds of ways for differentiated instructions. I use these sometimes as centers, I put a students with a piano, or a xylophone and let them invent their own songs. I also really like using composition for class evaluating, I say things like to see who has grasped certain concepts. These sheets are also great for substitute teachers who don’t mind a bit of noise. Just make sure writing music isn’t new for your students before you leave it for a sub.
These should be all the blank music you need for your classes primary-grade 3!