I have the PageFlip Butterfly. It does work with SongBook and NextPage, but not sure about GuitarTap or MusicNotes. It is compatible with iPad and Android apps. I have no complaints about it, except that it doesn't scroll, which I think I would have preferred over the turning of the page.
If you want a big screen, what about an iPad Pro, which has a 12.9" screen? It is expensive though.
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