You’re looking for a little app for your kids? Check out the music app called Awesome Xylophone, maybe the universal app can meet their requirements.
As its name implies, Awesome Xylophone is a virtual xylophone designed for both iPhone and iPad by Jonemo Yorn. In addition to simulating real xylophone, the music app also features high-quality sounds, simple user interface, xylophone mallets animation, and Retina display support. Apart from that, with the help of multi touch screen, you can easily also play chords using the virtual xylophone.
Awesome Xylophone with a size of 1.6MB is compatible with iPhone, iPod touch, and iPad running iOS 3.0 or later. At present, the music app is available for free. If you’re interested, jump to App Store for more details.