You will be surprised with the imagination and creativity of your kid at this tender age. You will not even come to know but he will now make a point to incorporate songs while playing or even begin his self made story while playing games withe peers.
What you need to know
His story telling and song incorporating skills are a crucial part of his creativity. The characters he will build on his own or the songs he will make up are maybe inspired from his daily routines or from the stories he has been listening to for long. Pay attention to his thoughts and improvise wherever necessary.