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SoundPrism is a composition tool for iPhone and iPad that allows you to create harmonies in any key, graphically build loops and compose effortlessly.
It has a column of a major chord sequence on the left that drone while the main interface area play notes within the key. It is free for iPhone. SoundPrism transforms complex music theoretical knowledge into an easy to use musical instrument.

For instructions on how to use it, visit http://www.soundprismhowto.com/howto2/index.php?show=intro