Here’s an app I released recently for both iOS and Android:
http://russpuppy.com/post/100847404090/kids-music-play-along-on-ios-and-android
iOS link: https://itunes.apple.com/us/app/kids-music-play-along/id930561807
Android link: https://play.google.com/store/apps/details?id=com.russpuppy.kidsmusicplayalong