The most-recommended curriculum for young beginners, designed for ages 5-6 but widely used with 4-year-olds. Short, playful lessons keep tiny attention spans engaged.
If you're starting a 4-year-old on piano, this book is the closest thing to a consensus pick — multiple piano teachers and parents on Reddit swear by it for this exact age.
“We are using the My First Piano Adventure series lesson book A. Its fun and entertaining for a preschooler. Practice at home is 3-5 minutes”