Play is of central importance here as it encourages flexible and imaginative thinking. And flexible and imaginative thinking is at the heart of creativity as ideas and thoughts are put together in different ways.
As these connections simmer in the brain, new ideas emerge. Sometimes these imaginative developments lead to an actual creation. Children learn to use media and songs before they can be really creative with them. They are more or less two separate processes as children learn songs, to use materials and master tool use for example. They are then freer to use their imaginations to make their own creations.