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Do you know ezcomposer?It's chord drag and drop based iPhone music composing app.
If you drag and drop the chords then it generates midi notes automatically.
Please see the youtube video
Free version of this released.
ezcomposerFree.
Try it. It looks nice.
http://itunes.apple.com/app/ezcomposerf ... 44355?mt=8 (http://itunes.apple.com/app/ezcomposerfree/id463144355?mt=8)