for choirs ...

Android 7 (Nougat) comes with inbuilt multi-screen functionality. Although Musescore does not seem to have full multi screen functionality yet, choristers who use a smartphone or tablet to display their score and lyrics while singing, can now together with the free Piano Companion app (displaying keyboard) in split screen mode, be able to pitch and sustain their cue note. I find it very useful, but of course would be better if Songbook would allow you to play and sustain a specific note from a score.