Learn to play piano by ear within days. 10 to 15 minutes each day (or however much you like) and after 1 week you will already gain powerful results in being able to play any melody by ear in any key. These skills transfer very well to all the other instruments (check out all the other instruments in the "..by Ear" series). Also works very well as a portable fun piano for quick ideas. To start ear training just press "Play" and repeat what youve heard. Then increase the level. Change major to minor, choose your key or just throw the dice for practicing new scale every day without much thinking! This app suits well a complete beginner but also an experienced musician to perfect relative pitch hearing.
Piano by Ear
