Teaching pitch: DIY Turn PVC pipes into a playground musical instrument. I wish this had the instructions with it, but I might be able to figure it out. This might even work as a service learning project for my daughters' school.
This picture was chosen to show how Music can be a way of learning in the outdoor play space. This music wall can be a good way for children to experiment by hitting the objects and observing the different types of noises that come from them.