GuiO’s ear training was modified to suit the smartphone an ‘ear training for a step-by-step practice’ published in Korea.
There are 315 exercises gradually increasing difficulty.

- How to exercises
1. A blank staff, a pencil, an eraser ready.
2. Write a clef, a time signature, a key signature, the first note of
the exercise presented in the app on the staff in advance.
3. Listen and repeat. Write the notes on the staff.
4. Check the correct answer.

Raise your ear training ability through adequate practice.