Great supplement
I teach private piano lessons and see about 55 kids a week. Ive been looking an app like this for a while. Its a great addition if youre using any method book. (faber, Alfred, bastian, etc.)
A few things Id like to see are a bit more separation on levels. For example, its hard for me to do the treble clef exercises with my younger kids because they might not know notes above treble G yet.
Id also like to see the ability to hook up a midi controller in the future. You can already do so with garage band using the camera connection kit.
I definitely plan on using this app in my lessons from now on. The kids enjoy it too because it breaks it up. Highly recommended!
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Music Theory for Beginners