iPad with GoodReader app will let you display and mark up your sheets. Our family, barbershop singers and choral directors, are very pleased with this capability. Most of our music is Finale output, not scanned, PDFs though.
I am not sure what you mean by no mirror-feature? iPad is reflective, though you might be able to get an anti-glare film.
I would think eInk would not be able to display a new page fast enough for playing / singing.
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