XpressPiano is an application for Nokia N97 with you can simulate some keys of piano in your mobile device. Highly advisable for travel with children 
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This application is developed in Python, specifically in the version 1.9.4, so if you already installed the version of Python 1.9.6 you will have to uninstall and install the 1.9.4 who comes in the installation program.
Install XpressPiano on drive C:, internal memory.
Woww !!
it’s fantastic program for piano guy
The black keys are out of tune.