Music score viewer allows you to view scanned pdf music scores.
The main idea after the application is that the music is an collection of musicsystem, not a collection of pages.
Rotation and skew of the pdf can be undone.
Remark that the pdf source should stay available, only metadata is stored
All music systems are put below each other, so you can scroll vertical through the entire music score.
It allows you to insert texts, comments and musical symbols in the score, and alllows you to repeat parts.
Optionally you can play music (mp3,midi) synchronized with your music score.