'Dr.Chord' is the app to assist users to develop their sense of tonality.
While singing a tune, users can test the sound of each chord progression just by clicking each chord button on the screen.
The app aims to make users acquire more advanced skills as they reproduce the tune they are familiar with.

[Sound of each chord]
Users will be able to recall the sounds such as Maj7, m7, 7th, sus4, dim, aug etc. just by looking at each chord name.

[The function of a chord in a chord progression or in tunes]
Users will be able to recall the sound just by looking at the degree name of each chord.

[Patterned chord progression]
Users will be able to re-harmonize the tune.