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diese App is a music theory education and reference app that helps you learn about music through interactive challenges and extensive reference material for piano and guitar. - Complete the Chord Progression: Test your understanding of keys and modes by figuring out which chord is missing. - Complete the Scale: Figure out which note is missing from the scale. - Note, Interval, Chord, and Scale identification challenges for piano and guitar. - Charts featuring chords for most common scales, useful for memorizing chords by key, transposing songs, or learning songs by ear.  We're hoping to make diese App the most approachable way of learning music theory, and would love to have your feedback as we plan out our next features.  Let us know your thoughts!