A free app for Android, by Piano Music Fun Inc..

Real Piano is an interactive piano app that will teach you how to play your favorite songs on the keyboard with great fun and enjoyment. This is one of the best piano apps for Android phones or tablets. The game is based on a realistic and intelligent keyboard with various types of music. You will learn how to play your favorite songs on the keyboard easily. There are many different types of songs that you can learn how to play.

This is available on the Google Play Store.