Movable Do system is very effective to develop your solfege technique. Because if you can feel music with movable Do in any key, you will be able to imagine functions of each scale degree.

But it's very difficult to get used to changes of the position of Do-Re-Mi depending on a key.
This application helps you to read a sheet music in movable Do system.
This application has only one view, and it's so easy to use. You will understand how to use immediately.
Please use this if you get confused reading Do-Re-Mi syllables in
movable Do system.
And this application also helps you to understand why the double sharp and double flat exist.