Yipes! I guess I misinterpreted the question, although I do recommend the three books I mentioned above. As iRP can't do everything I need, I supplement it on solo piano gigs with a binder of lead sheets, organized for my playlist. I had not heard of forScore (thanks dflat) but if I were to use it instead of a binder, I'd probably need a second iPad on the gig so I could see both; I think that switching between apps on a gig would be cumbersome and time-consuming. Amazing how iRP, originally a practice tool, has become so important for live performance.