Deemo. An incredible app-that's free only on iOS- where you can play songs on a piano. BUT this isn't a typical piano app, where you play randomly. BUT it;s like a game, where you can play songs and reach sweet levels!
You can read it's story line-yes, it has a story line-here:
I found out about it from my best friend-and twin who wouldn't stop annoying me about it! But soon, I grew fond of it! You can listen to all of the app's songs on youtube.
Here are my favorite!
Wings Of Piano
Redlection (Mirror Night)
They're epic~! :]
PREPARE TO BE AMAZED~!!!