A vibrant cartoon with colours and smooth animation. Create a colorful, cheerful 3D animated preschool music video called "School Is a Happy Place". Main characters: three cute preschool children, around 5-6 years old, with consistent appearances throughout the entire video. They are happy, friendly, energetic and expressive. Use bright colorful clothing, a colorful school building, classroom, playground, books, pencils, numbers, letters and friendly animal decorations. The video should feel like a joyful preschool nursery rhyme. Use colorful 3D cartoon animation, soft rounded characters, big expressive eyes, playful movements, bright lighting and fun camera movements. The story follows the children getting ready for school, walking to school, learning numbers and letters, reading, drawing, playing with friends, helping each other, making small mistakes and trying again, then celebrating together. Keep the same three children, same clothing, same colors and same character designs in every scene. Create smooth transitions between scenes. Make the children frequently smile, wave, clap, dance, jump and interact naturally with the environment. The overall message is that school is a happy, safe and fun place where children learn, play, make friends and help each other. Do NOT add written lyrics or subtitles inside the animation. Leave the scenes visually clean so the song can be added separated