Most children at this age aren't quite ready to start with formal piano lessons and curriculum, but they should definitely be encouraged to play around on the keyboard and experiment with sounds and rhythms.
Child Beginners Young Children (3-5 Years Old) If you're not sure where to start, learn what to look for in a good piano teacher. Making the commitment to weekly private lessons will encourage you or your child to practice consistently and will make your musical journey much smoother and more enjoyable.
If you or your child wish to make progress in piano, you absolutely need a piano teacher.
