I have been using 'unrealBook' app (music display app) on my iPad for a couple of years. Works real well. It's easy to set up Set Lists, quick to do searches, and I use the "database" or "metadata" function alot so I can search for songs by year, decade, singer/band name, genre, tempo, etc.
It works with PDF files (as most of them do, probably).
It also has network or 'master/slave' capabilities; for my band, we use 3 iPads running unrealBook, and mine is the master; the others change page/song whenever I change mine. When I play solo, I just use the one iPad with unrealBook.
If anyone else is using unrealBook and needs help, let me know and I'll try to help or answer questions ...
Jim
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Genos / Tyros5 / HK Lucas Nano 600 / FTB Maxx 40a / EV ZX1A / Rock'n'Roller cart / Hauptwerk virtual pipe organ / misc other audio & music toys