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UPDATE: I will be unpublishing this app on the 21/08/2013. If you like this app please download the new and improved version!
It's called "Piano Chords And Scales". It's the same as this app, with new features and themes. It's 100% free. Also I'll be updating the new app based on your recommendations. Link below.
https://play.google.com/store/apps/details?id=com.rushil.pianotutor1
Or you can check out the "other apps by this developer" on google play.