I am a musician and got a cybook gen3. (6' screen device, like the BeBook). It came with a number of demo files, one of them was a pdf with some J.S.Bach piece.
Forget about playing music from eInk, at least at the moment:
The screen is way too small. To my feeling even A4 can be on the small side. It has a reason, that many publishers pubish in formats larger than A4.
Pageturning takes almost one second. While this does not disturb me when reading, it certainly would when playing.
And most important: I write fingerings and all kinds of signs about interpretation into the sheet-music. This is not possible with most readers around (I know the Iliad can do that), so what's the point.
I also thought about this technical approach, but honestly, it would feel really weird to walk on stage with an Iliad, place it on a stand and then play from that. Eventually the thing freezes and I need to tell the audience "oh, sorry, please hang on a moment, I just need to reboot my device..." (I could use the time to tune the instrument as well). No no, not for me. Paper is maybe extremely oldfashioned (although I do use music-editing software), but it's so safe.
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