What app is on the US store homepage?

sorry silly question but, know app on apple store homepage, below red ipad2 "buy now" button, shows sheet music , piano keyboard.

thanks!

 

here go
http://itunes.apple.com/us/app/steinway-etude/id430004407?mt=8

it's apple ipad apps page
http://www.apple.com/ipad/from-the-app-store/music.html

 

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