Zoundio Notebook hit the App Store today and offers a worry-free way of making music. Especially tailored to beginners or new musicians trying to learn notes, Zoundio NB lets you pick and arrange from a list of predefined chords over which you’re able to jam in a Guitar Hero like interface, all perfectly in tune within the chord that’s currently playing.
The app video will probably give you a better idea:
As you can see, there is nothing getting in the way of arranging a good sounding tune as a beginner. I like the interface especially and would love to see something similar in a ‘pro’ music app sometime.