GuiO’s sight singing was modified to suit the smartphone an ’sight singing for a step-by-step practice’ published in Korea.
There are 466 exercises gradually increasing difficulty.

- How to exercises
1. When you select a song number, hear the first sound
comes out.
2. Recognize and sing the exercise.
3. Listen to the exercise. And check the correct answer.

Raise your sight singing ability through adequate practice.